Check out the book, "Burnout: The Secret to Unlocking the Stress Cycle".

https://www.goodreads.com/en/book/show/42397849

I found it helpful in understanding the underlying causes of my own feelings of burnout. Also, don't be put off that the book says it's for women. The core lessons seem to apply to everyone.

(comment copied from earlier conversation on a similar topic: https://news.ycombinator.com/item?id=35849384)