Pain 2 years post op

Hi everyone, its been about 2 years post op and i am still feeling pain in several areas of my knee. Mainly at the back, especially when i stand on just the heel of my foot and put weight on it. Sometimes when I run or exert pushing force with my leg, the button area hurts too? Would really appreciate some advice on what exercises i can do to strengthen areas I might be lacking in, or maybe some stretches to do? I stopped going got pt mainly because it seemed really unhelpful and redundant and they never could answer the questions I had to the pains i experienced. I’m not very confident in my knee enough to exert too much force and start sprinting but I am able to do single leg jumps.