Tough spot, but some suggestions I can think off the top of my head:

for organizing: come election time you can phone bank from home. Find a progressive cause or candidate you believe in and they’ll usually have a system set up and script for you to call or text and a list of phone numbers. This can also be an entry point into the campaign to volunteer to do other things and you can explain your situation

For exercise:

• you can buy some weights online and use those along with body weight exercise to work out. I mostly do cardio so I’m not too familiar but I’m sure there are plenty of guides online

• walk a dog. If you don’t have a dog you can probably find a neighbor near you who would be happy to have there dog walked. Idk how restrictive your living situation is but I’d hope that walking the neighbor’s dog would get you permission.

• try vr if you can afford it, some of the games will get you moving and sweating and are pretty fun, there are also guided workouts as well.

Whatever you do just start a regiment that you can do and keep to it. You probably won’t see progress for a while but if you do keep on it and make it a habit you should start to notice your mood improve.