Maybe an honest..at least tactfully honest talk with management is in order.

1.  "love the company".. 

2.  love a lot of things about my job

3.  but.. the issues with on-call turning into more than 8 hours of additional work is becoming overwhelming.. maybe they need to bring someone new on to help take some load.

4.  you are finding that you aren't getting as many "interesting" assignments.... would love to get some like xyz (give some exampls).. been here X years and are very capable of managing them on your own.

5.  You think this is a relationship worth fixing.. definitely many positives.. but you want to know what they may be able to do to help with some of the concerns?

the best advice I have ever received. It applies to just about any action based solution to a problem.

The hardest thing about (fill in the blank) is filling out the (application). The advice was directed at me when I was going through my divorce, I was burned out running my company, and I was working through finally focusing on completing my BS degree. 

I took the advice, filled out the engineering school application, sold my share of my company to my business partners, the divorce was final, and I got out of my own way.  3yrs later I graduated with my BSEE, 5mos after that I married my soul mate, and ... the rest is our unfolding future of adventure.

For my DW, thought it took forever for her to do it, once she clicked the (Open to) button on Linkedin, the ball started rolling and it rolled very quickly.

Recruiters started blowing her up, she ended up with 4 interviews and received 3 offers.  The company that did not make her an offer felt she was severly over qualified and would not stay long term.

The one she took is with an outstanding firm rated as a top place to work in all 6 states they operate in.  Her base salary offer was more than her base + 1000/hrs per year of OT, higher VC, and at her 60day Partner review they put her on Partner Track.  She now works 40-50hrs per week, hybrid between home officing and working in the firm office, she looks 10 years younger, no more devistating anxiety attacks, only some reasonably slight residual guilt about her former coworkers still killing themselves at the old firm and a few clients that she feels that she abandoned.  

But, the new firm positive environment, extreme upgrade in professionalism, and her quality of life are so notably better that she actually has to work at it to feel bad about having left the shit storm she battled for 4.5 years.

All she had to do was click a button on linked in... and get out of her own way.

Click the button.

Never forget, if you die, they will replace  you. If you resign, they will replace you.  The pain for them at your loss is only temporary and short term.

In my nearly 40 year career I learned due to industry down turns, etc... we can only be as loyal as our financial situation will allow. I learned a far more important related lesson many years later.  We can only be as loyal as our quality of life... and financial situation will allow.  Adjustments to the pandemic not withstanding, those lessons have held true for 3+ decades.

Click the button and take care of you.  Every second you delay, is a second where you die just a little bit. Do not do that to yourself.

Make a quick update to your LI profile, click the button, when the recruiters start beating down your door, revise your resume and jump to an exciting new opportunity.  Commitment to the excuses of tolerating the intolerable is a choice.  Choose  you.  THEY do not matter. Never have, never will.

Take care of  you.

Recruiters have been banging on my door too.  I am taking it slow because DW is in such a great place.  The calls I am getting are for Director or above positions though in places I have zero interest in living. I would do a remote office and 50% travel role.  None of those have floated... yet.

I was at that point many years ago (despite working unreal hours and doing the impossible, meriting a near perfect evaluation, I was told that I wouldn't be getting a raise because my salary was sufficient...). So, I started looking for other opportunities (don't start with the resume, start with the job opportunities).

Anyway, I went to an interview that offered considerably more.  It would have required ten more minutes travel plus a dangerous intersection, it would have been in a cube farm, and there would have been no creative work (one of the things I lived for) only correcting the English written by Italian engineers. Where's the job satisfaction in that? I had free rein in my work, had my own office and loved what I did. So, when I got the job offer, I turned it down. 

Don't focus on your resume. When you're good, employers see that. Just look for opportunities and then hone your presentation.

FWIW, they called me back and offered a 30% increase with respect to my salary. I politely declined. Then they asked me how much it would take for me to work for them. The truth was that given the conditions and the content of the job, you could have tripled my salary and I would have still turned the offer down.

Put out feelers. Use the first interviews as practice. You'll be surprised at how empowering the whole process is.

Sadly I know the feeling. I used to work at a toxic work enviroment where we were treated like robots constantly overloading us with work, feeling like I was on a hamster wheel, and working more than the 40hrs for free bc I was on salary and it HAD to get done. 

Their systems were ineffecient, the managers were demanding and aggressive, the job duties were constantly changing/workload constantly increasing. 

And once they realized you were fed up, or if you complained, then they tried to do any and everything to get you fired.

It was H3LL!

Anyways.......

Can you delegate?

If you have a chunck of disposable money, prepaid legal, or know a lawyer.......consult with a lawyer and see what you can do to push back against your boss without getting fired. HR is useless and sides with the employer so I wouldn't trust them. But if you have an employment lawyer you know what you can do/say to keep your job, get your boss off your back, which will buy time for you to look for other opportunities. 

Stack as much money as you can ...... juuuuust in case

Good advice above.

Can you hire a professional to write your resume?

Our help desk at work used to be able to fix things over the phone.. now everything is a ticket. I wonder (I literally have no idea) if there was a shift in IT that made jobs like yours that much harder by eliminating the "middle man."

I am totally guessing here.

For some reason (im liked **wink**) by people way above me and they have had me work directly with them on things that impact us at store level so I understand the flip side to IT issues and programs etc. BUT there seems to be no "easy" fixes anymore like there was with more blanket programs. 

Are things more complicated and they need your level of expertise and no one else can do it? If that's the case try laying a boundary of what you will do and see how your boss goes about it first.

Thats my first suggestion. 

We all forget that a salary wage does not mean unlimited time. It's based on a 40 hr work week with flexibility for some extra hours when required. It's not carte blanche for an employer to demand regular overtime hours to finish standard work.

I've advised friends the my need to ask for a raise or push back on the 24/7 crazy demands. I myself could work much longer hours, but really, the work will always be there. It's never done and I don't believe in sacrificing my mental health or my time for work, no matter how much I like the job. I also let my supervisors know this straight up, repeatedly, and set expectations for everyone I work with and supervise. Luckily I work with great people.

Which yielded few results.   I was doing ALL the hardware and software for the 911 center and the sheriff deputies as well as external requests from the local and state police, ambulances, campus security and fire depts.

Although I prefer doing hardware, I told mgmt that I'm literally going to have a coronary if they don't take hardware off my plate.  That got delegated to one of the other emoloyees but then you have to contend with the "clean up" from those who aren't detail oriented so it still eventually lands on your plate anyway. 

AND the fact that the guy I took over for only did the software and was paid 2 grades higher than me which they never reimbursed me for.   

Now that I've left I know they did not read my notes on shutting off access and that higher pay grade people have been saddled with my old job.

My advice is to start looking now before the economy moves farther south.  Start quiet quitting and reserve time to get that resume done.