Endings are hard. Ask anyone who's invested in a long-running TV show or book series or, yes, film franchise. Stories like The Lord of the Rings or even the Harry Potter series are usually the exception to the rule, especially when you're dealing with a franchise spread across four decades being helmed by a half-a-dozen directors and a small army of writers, script doctors, and editors who had major hands in shaping the story.
Unfortunately, Star Wars Episode IX: The Rise of Skywalker lands closer to The Dark Knight Rises than to even the original trilogy's Return of the Jedi. It's not bad, but it's over-stuffed and unfocused and winds up selling some of the dramatic turns of the previous two films short. It's rousing and exciting in the moment, but leaves little of substance after it departs.
Like I said, endings are hard.