I’ve been thinking back to my younger days when I was doing MMA and wrestling… Try swimming, cycling, rowing, and take it slow with leg training, using light weights just to get that knee stronger. My left foot… I can’t do much with it bad knee and severe chronic plantar fasciitis. I struggle a lot daily wth a limp and everything, but I still walk on the treadmill at an incline for 30 minutes, and in the summer I hit the pool 🏊♂️. You’re not far off, bro you’ve got this, man.