There's not much to do after Jedi. From what I've read, the only reason Lucas ever planned to make the third trilogy was so Luke could find his sister and confront the Emperor. Then that became the last half of Jedi. The Emperor was the mastermind behind all the evil in the universe, now he's dead. Who are they gonna fight against? Opportunistic despots--ooh!--scary!
The period most ripe for stories is between Revenge of the SIth and Empire Strikes Back.