Well said. Focus on what you can do. I hat 3 knee surgeries and my Dr said I wouldn't walk, but I didn't listen and walking is what I do. 1+ hour a day. Without it, I have more knee pain.

Experiment. Try different things, though try and varying them one at a time, so you can know what has an impact.

I never think about the fact that I can't run or ski or whatever.