In my case, beggars can't be choosey. So I just sit on a thin airbed that a friend gave to me (My big, comfy airbed broke, so I was sleeping/camming on the floor for a short while). Years ago when I was several pounds lighter, I had a pink butterfly chair that I'd sit on. But with your arthritis in your hip, I wouldn't recommend that. The last time I had a "normal" bed was in 2019.
I'm not sure if you ever shop at thrift stores or the Goodwill store, but maybe take a look there to see if they have any comfy chairs. They might have one at a fraction of the price you'd pay for a La-Z-Boy chair. But that La-Z-Boy you're interested in sounds amazing, so if that's what you're interested in and can afford to get it now, go for it!
As for changing things up a little, wall decor or a poster is cool. Valentine's Day is in three weeks, and stores have out those pretty pink or red string lights. I just saw some at Big Lots the other day. St. Patrick's Day is in March, and I'm sure some models will be wearing green and/or having green room decor.
If you ever want a change from camming in your bedroom, you can cam in your living room if you have the privacy to do so.