While of course we're going to see more stuff covering other aspects of the 60-year something span of the saga, and before (High Republic), I'm wondering if we'll see some continuation post episode 9.
I think at one point Lucas did consider a twelve part saga before limiting it to 9 in his original 80's plans.
While of course the prequel trilogy led to the state of things by the time of the OT, ROTJ pretty much didn't leave much clue to what would happen next, apart from Luke "passing on what he had learned". It's assumed by many that the Rebellion would restore the Republic, although I'm not sure the full name of the Rebel alliance goal being "The Alliance to restore the Republic" entered into things (The "Restore freedom and justice" I think appears in the opening crawls, but not "Restore the Republic").
I assume the resistance would probably try to do that I guess, although while TLJ seems to indicate that the First Order has pretty much restored the Empire's hold over the galaxy, ROS seems to imply they're still not quite there yet as Poe and others mention "free worlds" and the First Order seems mostly willing to accept Palpatine's fleet to become a "true empire". Either that or Ren's one year reign has been so poor he's actually lost several worlds somehow.
One thing would be how the Resistance would correct the mistakes of the two previous Republics, but that might be an issue. The sequel trilogy Republic's problem was partially that it had sort of a weak (If "Cherished" fleet), since they didn't want to repeat the militarization that led to the Clone Wars and eventually the Empire, which was the old Republic problem.
So maybe a more balanced approach would be needed?
As for Rey rebuilding the Jedi, Luke in TLJ did state the order is somewhat obselete and maybe Rey will take that advice, perhaps being a one-person force for good instead of rebuilding the order (Luke also was initially reluctant to rebuild the order as well, it seems, as most of the media pretty much has him go on a Jedi scavenger hunt until it's encouraged he rebuild the Jedi, perhaps manipulated by Palpatine/Snoke so they could get a hold of Ben)....but she does of course have potential students as we know there's other force sensitives around-not only the Canto Bight kid but of course Finn. The Poe Dameron comic series also sort of implied he had some possible force abilities too, living next to a "force tree" for instance.