I'll add one more maintenance suggestion: patella mobility. I've had what I call very extremely minor barely noticeable but noticeable patella-femoral garbage due to a kneecap that doesn't track quite right for years. It's never sidelined me. At the suggestion of a physical therapist years ago, I started doing patella mobilization 3 or so nights a week just before I go to bed, only for a couple of minutes. This consists of me relaxing the leg (out straight) and pushing the patella around. For me, pushing the patella side to side keeps it happy. When I do this with regularity, I have zero symptoms. When I slack off, it talks to me a little.

It certainly won't hurt and it only takes a couple of minutes.