I started doing even just a few of KneesOverToesGuy’s cornerstone exercises a couple months ago, and the results have been very encouraging. I have just watched a ton of his YouTube videos, then figure out ways to do his exercises in my garage gym, and mix them into my workouts throughout the week. Give it a shot!
Been struggling with general strength imbalance in my left knee for over a decade, which has resulted in ITBS while running and hiking, various sharp pains during certain movement patterns, etc. Two years ago, it hurt bad if I tried to do a step up with my left leg. Yesterday I did a couple hundred with a 45# pack in my garage, and felt strong.
One thing I did do about 4 years ago was met with a doctor and got an MRI on my knee, to either confirm or rule out actual injury.