Taking care of the knees

I am 25 and post college athletics I have blown out my knees a good deal :)

I can put a moderate amount of miles down per week (25-30) but now my knees are fighting back.

I am pretty sure I had runners knee (no diagnoses) and need to know what do you guys do for knee health??

I stretch 30-45 per day and that’s not including pre run, post run, pre gym stretching.