Yeah i am goofy as well and also had the surgery on my right knee. i've been focusing on heavy lifting of my quad, hamstring, and calf back in the gym just to be sure that i have a stury base. Now that i think about it i've probably been neglecting my rom and flexability a little bit too much.
Yeah those are all good things to do. Also would recommend squats on an indo board. A lot of those mini, stabilization muscles need to return as well the main muscles before you start shredding like before. I definitely came back stronger than before, so the sky is limit if you're diligent and responsible with your rehab. Be patient and good luck bro