You may need to do some trigger point release and massage. You might need to get a tennis / lacross balls, anything with a round solid surface that can roll with you for that.
It may have something to do with fibromyalgia or simply due to repeat use. You might need to work on the tensor fascia latae. Look it up via youtube videos and images related to origin and insertion of knee muscles
IDK exactly which spot on the knees but it’s often at times due to some overactive and ‘trapped fibers’ and ‘overcompensation’ of weaker muscle fibers. ‘Palpate’ / lightly pluck along your muscle groups and slowly move to figure out what is tight and what is weak / underactive
It can relate to the IT band (mainly TFL muscle as it’s the origin) and possibly the inner thigh muscles. Anything thigh and hip or calves, even feet related.
I recommend better ergonomic shoes like barefoot shoes.
I recommend doing exercises for improving mobility of the hip joints and knee instead of stretches.
Try the spa day muscle massage while doing the foam rolling.
Take some omega 3 and protein synthesis related & electrolyte liquid sources as well. Magnesium and any other vitamin sources to help relax muscles.
You might need to use the symmetrical body to balance out any muscular imbalances too and some spine related fields
Do some detox related fields such as lymphatic blockage removal (as a form of something like lymphatic massage) after everything to help flush out the wastes
Dont forget to let it rest and not overwork it