not a 'take a vacation' answer, i promise.
context: about 18 months ago i was at a point where i'd cry in the car after work for no specific reason. couldn't concentrate. stopped replying to friends. the whole thing.
the stuff that actually moved the needle for me: stopped trying to fix the burnout AND the job at the same time. picked one. decided the job was a known quantity and i had to accept it temporarily while i rebuilt capacity. cut one recurring obligation that wasn't required. one thing. not five. just one. this sounds trivial but the space it created was disproportionate. stopped tracking progress. had been journaling 'am i getting better' which turns out is a bad idea when you're recovering. too much self-surveillance. found one thing that felt like play with zero output attached. for me it was cooking things i'd never cooked before. nobody graded it.
it took about four months before i felt like myself. then i made career changes from a more stable place. doing it in that order mattered.