Dedicate a time slot to go outside, for a walk, do not submit to pressure to keep working a day long.
Lift weights, helps you keep in shape. Invest in a backup internet line, etc.
Have water/bathroom/coffee/tea/snack breaks every 1 hour.
Unplug PS4, TV, Atari.
If you cannot suffer the silence search for a classic music/instrumental music (whatever soft "elevator" music you may tolerate/like) on Spotify/etc. Find something with 20h total duration, hit the random button, set it on 5-15% volume and let it play.
Edit: I LOVED the "walk around the block idea, I am making it happen!!
Also in the Edit: change clothes, don't wear suit and tie, but don't stay with pyjamas (especially when walking around the block). Wear proper clothes, or at least tracksuit, something other than sleepwear.
Also in the Edit: make sure you check what your camera "sees" in the background, and clean that up.. wall=OK, pile of laundry 3 weeks old= NOT ok
I can only assume that's why Teams has the "blur background" option.