I experienced major burnout after a 4 year stint in an early stage startup, and I walked away. I had a six week break which was wonderful, but the next step I took after that was essentially a similarly stressful (but rehigh profile) job. I lasted a year.
Now I have a less prestigious job, at a less recognisable (but much more compassionate) company. I've moved out of the big tech hub city and now I work remote. I'm much, much happier, and have something approximating a healthy work life balance. I can walk to quiet woodland from my house, where I work, which helps.
The hardest step, which still troubles me from time to time, is stopping striving. I could be earning more, have a better job title, etc. But I remind myself I don't want those things more than I want a fundamentally comfortable life with ample time to spend with family and friends.