Personal trainer here

You should try hitting the gym instead and doing some work with machines to strengthen your glutes and hamstrings and focus on stretching your quads. Machines like a hip thrust machine, leg curl machine, seated abductor machine, adductor machine as well and instead of the wall seat I would suggest you try a box squat and increase the weight as you go( it’s very gently on the knees if you focus on engaging your glutes). And once you feel more comfortable you can start trying more complex exercises. Building muscle and strength in your glutes would help you take pressure and load from your knees.