Home exercises that don’t engage arms at all cause I have a damn tumor on my bicep :((

I’m 23f and almost 2 years ago I’ve started my journey to lose 30kg, and I did lose it. I’ve been maintaining for almost a year. Like a month after starting my fitness journey I found a tumor on my right tricep, which turned out to be desmoid type fibromatosis. I had 2 surgeries, the last one in January, and a week ago I found out the tumor still wasn’t completely removed and I already can see and feel it growing back. I really wanted to go to the gym, start lifting, become strong again and deal with my skinny fat physique but that’s still not an option for me.

I’m looking for recs of some good exercises at home that don’t engage the arms. Even using dumbells for things like rdls is causing pain and swelling for me. I could probably get away with using my hands to raise myself like in donkey kicks but I can’t lift anything.

I would love to work on my back, glutes and legs. Not sure if back will be possible though.

I can invest in some basic equipment.

Thank you in advance for any recs