Plageman
Explorer
Anakin's story has already been expanded greatly through the Clone Wars tv series. Heck you could even roll in Rebels with its Darth Vader arcs. Luke and Leia could still be part of a "cinematic" universe through the same sort of initiative; TV Series, comics and novels can fill that gap.Do an "Ultimate Skywalker Saga" with more focus on the fall of Anakin and the conclusion of the Saga after Luke with more fresh ideas and more love for the old characters and storyarcs.
However...
With where we find these characters in the Force Awakens makes it complicated to create something interesting since they are set for a "failure" narrative with no greater story to tell (there is nothing akin to the clone wars in the time gap).
Still what I noticed with The Mandalorian, Star Wars Rebels, and even with Resistance, it's that these days SW stories are more interesting when not seen through the eyes of the "movie" protagonists. Since we have no idea of what their arcs are going to be you can genuinely be intrigued by their journeys...