Star Wars: The Last Jedi allowed Kylo Ren to have more agency as a villain, but Star Wars: The Rise of Skywalker reversed all those changes. As the most prominent villain in the Star Wars sequel trilogy, Kylo Ren had big shoes to fill. Not only is Darth Vader still one of the most iconic villains in popular culture today, but Kylo's background intrinsically linked him to the Skywalker family and all the baggage that comes with it. As the child of Leia Organa and Han Solo, Kylo needed to have an arc of his own in the sequel trilogy, one that would explain how someone born from the light could turn to the dark.
https://screenrant.com/last-jedi-kylo-ren-story-rise-skywalker-ruin/