I am in a wheelchair too, so can only relate what I've done in the past. But...!
You could still tutor a child from your wheelchair.
Do you sew, crochet or knit? You could sell those things, and/or teach someone else to sew/crochet/knit.
Do you write? You could Freelance; or the local newspaper may need a column writer.
Do you read aloud well? Some companies need readers for audio books.
Do you draw or paint? You could teach others to use art skills. You could create something and sell it.
It depends on how much energy you have, of course. I pray you'll find the solution you need, Lena. Hang in there!