Why are you trying to not have surgery when most folks do very well after knee replacement? If you choose to wait and try alternative methods it’s your call and it’s a crap shoot.
I injured my knee at 17 and had open surgery for torn meniscus. Twenty-five years later I had both knees scoped and had 75% bone on bone. But I’ve always been a walker and stair climber from a young age and as a nurse I was always on my feet. Now at 72 my knees are great. For some reason I’ve not encountered any problems and I walk two miles daily.