Star Wars is a story about a farm boy, an old wizard and a pirate who rescue a princess from an evil sorcerer in an impregnable castle. The sci-fi part is just window dressing.
You almost exactly described “The Princess Bride”! (The “old wizard” part in that movie is distributed among several characters.)
That WAS SF in the old days.
Burroughs Mars books for instance are just that, wild adventures in a more exotic setting. He could have set them as Caribbean pirate tales just as easily, or as Louis L’Amour westerns, or redone medieval fantasy in the setting of Orlando Furioso. Its just that in his time Mars, Aliens and super-science were cooler.