By the end of the movie he was changed. His incubated little world was shattered. Crushed. He gained a wider understanding of his own nature and who and what he was up against. He started out uninformed, arrogant, and hotheaded. He ended up informed, humbled, and reflective.
Isn’t that what we call change?
Where exactly is this “change” reflected in the film? The only scene in the film that comes after indicates the exact opposite, as Luke decides to go for another friend-saving adventure instead of going back to Yoda.