I was hard burnt out, all the symptoms, literally thought I’d never work again. I’ve come back now and i’ll tell you what worked for me. YMMV.

Didn’t quit. Started working 20-30hrs per week max. Let everything that couldn’t fit in that truly slide. Cultivated DGAF attitude, concentrated on self-care out of the office (with extra time I had from working low hours).

Took a long, long time at this reduced pace, maybe 6 - 9 months of thinking “ok, this is sustainable” and eventually got recharged...