Wfh since long before covid (15 years) . It will 100% burn you out slowly while you think you are better and stronger than it. Feels good at the beginning likely b.c your current job is super toxic and your away from your boss but there are many factors largely due to isolation that will settle in.

To survive wfh you need to concentrate heavily on early morning sunlight, walks throughout the day, yoga, acupuncture, blue light glasses at night time, major attempts to get out and socialize outside of work, creating a safe place in your home for working so you don't mix them together, get out in nature, tend to a garden otherwise aka try really hard not to work after hours and offset the toxicity of wfh.