I like the idea of asking for a 4-day, 32-hour week.
Or 4-day 30-hour week.
The 30 hours is important for America -- because of health insurance.
If none of that works, try to get 20 hrs/week part time, so you don't starve, go homeless, etc.
I doubt it's actually enough to fix burnout, but...worth a shot?
I wonder if there are any 9-5 jobs out there that are still interesting -- where you get to do more than just 'x'. I'm thinking - in a comfy corporate setting - the one with health insurance.
I guess some jobs are genuinely more interesting than others, but...getting one that you're never going to be seriously considered for -- don't know what the answer is for that.
I don't know if it was more Taylor or Ford or whoever, but Adam Smith did warn that capitalism would lead to humans who would naturally lose the desire to do braindead work, and become "as stupid and ignorant as it is possible for a human creature to become."
So from that POV, burnout shouldn't surprise.
I think managers are on the good/bad spectrum -- but that's totally missing the point.
Even if you're sexing your manager, you might get a rude awakening when your performance start's affecting your manager's/sex partner's career.
Don't hate the player, hate the game.
Take week vacation, or more, maybe you can do a week or two to recharge, unpaid, etc.
All the usual stuff applies and likely won't help - eating right, exercise, sleep, socializing, getting outside, enough B12, get blood work done if/while you can, see if you have deficiencies affecting energy levels.
Maybe meditation? I'm a believer, but don't do it.
Or, try to transfer within the company. Last time I tried that, it didn't work, I stayed too long, should have bounced, was a complete disaster, literally almost killed me, etc.
So that's probably my best advice -- try to be willing to consider doing those things which you won't consider doing to support yourself while you un-burn-out -- drive for uber, stocking grocery store shelves, etc.
One thing I realized now that I'm an old -- people go thru crazy stuff. Like, I'll say something pretty revealing about some stuff I went thru in life or work or whatever -- casual convo at the bar, American-style, whatever -- and someone will be like, "Oh yeah, me too, but [insert their 10x story here]."
I'm like, 'J** F** -- like how are you still here??' :-D
People at work have gone thru and are going thru that.
BUT...trusting that to your manager? Sometimes it's the only play you got, and usually, imo and experience, I would _not_ recommend playing that card.
Instead, you're fine, you're energized, you _love_ your job and always will and are energized for more work -- it's just that you "want new challenges".
I feel like it's super-easy to quit yourself out of a job, especially when you're low-energy/depressed/burned-out/intellectually-and-emotionally-defenseless when your manager or your manager's manager says, "So I hear you're not feeling motivated??"