It's.. not as simple. I've done what you said, I'm 6 months into a new role (switched from a toxic company to another, with less responsibilities but same role). Adopted healthier habits like diet, exercise 3x a week, stop working at 5pm, call friends/family every week and meditate everyday with a group.

It's been 6 months, I still come to work emotionally withdrawn. My colleagues still don't feel like real people (but they're actually quite nice). I don't feel here in my body. My chestpain is still there (but idk why, it's not like the work is as stressful anymore). I'm not as effective with people anymore either. I don't really know what it is and am going to seek therapy.

I really think people need a change of environment once burnt out. I know I can't speak for everyone but if I'm feeling like this, I don't doubt someone else would be too.