Luke went to dagobah for training with Yoda for a long time, then spent years more training after that. And then then he was no match for Vader and palpatine, they were still toying with him just trying to turn him to the dark side. What he really did was make Anakin look inward and redeem himself by killing the emperor. He became a competent Jedi but never became stronger than everybody else before him like Rey did.