Have you talked to an orthopaedic specialist/sports physician about surgical procedures to stabilise the patella? this may involve tightening up the damaged retinaculum (one of the the structures that holds the patella in place). This is different to the arthroscopic repairs that you had done as these involve structures inside the capsule of the knee joint

Have you tried wearing a patella stabilizing brace as well as lots and lots of quadriceps exercises that emphasise activation of the medial vastus? (and then some more).

You may well have a very shallow groove for the patella to fit into in which case even surgery wouldn't achieve patella stability.

If you have exhausted all of these avenues then a period of rest/recovery may be mandatory. Maybe you could think of an alternate sport like diving that uses similar skills.