I would want to develop the years in between ROTS and ANH, the Core Worlds during the events of the Original Trilogy, and the Old Republic era. I would look to what was planned for Underworld and hire James Luceno as a writer. I would make all the planned The Clone Wars episodes. Legends would continue. I would release all versions and sound mixes for all the movies and complete soundtracks for all the movies.
2012: I would declare movies and tv series going forwards to be a “Star Wars Cinematic Universe” and Legends to be “Coruscant-616”.
Now: I would establish a policy that anything that isn’t labeled as canon isn’t canon. I would make Solo 2. I would make everything less secretive.