I'm so sorry to hear about your declining health, but I'm also glad to hear you're trying to get back into plants!
I'm pretty new to this as well, but I had major depressive episodes a few years back and was able to help one plant absolutely thrive; MINT!
Put it in a room with decent to good sunlight, a room you're in frequently, and keep it in a container that can hold a little bit of water.
I was gifted the roots of a mint plant when I first moved out, put it in my bedroom window, and really rarely watered it. When I did, I didn't know something as simple as over-watering can kill a plant, so every other week I'd drench the poor thing until the next time I remembered. With my depression, I went to work and then my bedroom, so I'd spend a lot of time around the plant too.
By almost a year later, it was massive. It needed a 1' x 1' pot, it had little vines growing from it from the windowsill to the floor, and it smelled so divine. Plus, it's mint, so sometimes I'd take a little nibble!
I'm unsure of your lifestyle nor the animals you have, so definitely do some research before a purchase, but based off of my own research mint is great to fight moisture that caused SFG/Mold in homes too. Doesn't prevent it from happening, but it did amazing in my crummy apartment.