The full acceptance of burnout seems important. ie, rather than cling to old ideas about who you are and what you want, at a certain point it's best to let go of your ambitions and simply embrace life in whatever way you can. I remember one conversation I had on a bus in Thailand some years back:
"What do you do?" "Oh, I'm a burnout from China. I mean, I was starting a company there, and I sort of imploded. Oh, the business didn't fail, it's still running... I just failed. At being me."
It was the first time in my adult life that I didn't have an impressive story to tell about what I was achieving.
Failure, instead of driving people away (as I'd feared), led to more empathy and deeper relationships. And instead of harming my career, it gave me the freedom to explore my interests without the pressure to achieve, which helped me figure out what I really enjoy. I'm now working crazy hours again, but it's so well aligned with my values and interests that I rarely feel stressed. (And I take better care of myself, because I know what can happen if I don't.)