If it isn’t triggering to your eating issues, would you be able to do some other form of exercise such as walking?
I would also suggest some crafts or hobbies such as knitting or sewing. Making cards is another good creative hobby and not expensive.
You could also consider studying but on your own time so there is no pressure. There are lots of free online courses that you might enjoy. You could study something like art or film or whatever interests you, just for fun with no particular goal in mind.
If you feel well enough you could consider doing some volunteer work. Lots of charities are grateful to have someone help even a few hours a week.
I hope you find something and that you feel more at peace soon.