foam rolling is ok to start, but it's too big.
try use your fingers on the VMO and long adductor area
Then get 10cm sized ball and lie down on it, wedged on the inner thigh and roll up the long adductor, super painful for me.
You can also wedge the ball between the legs while you lie on your side, the weight of both legs will put a lot of pressure.
and then the short adductor up near the groin - use a bigger hard ball around the 12-15cm size, and sit on it, on a chair not the floor, wedge it between the glute and groin and then move down lower etc