Okay, so I re-read the whole series recently just to make sure I remembered the ending of 'The Land of Stories' correctly. The final book, 'Worlds Collide', wraps up the massive conflict between the Fairy Council and the Literary Army. Alex and Conner basically have to unite every story world imaginable to stop this ancient chaos magic. It gets pretty epic, with characters from classic tales, myths, and even some original creations joining the fight. Alex embraces her role as a fairy, and Conner solidifies his as a writer – that duality the whole series was building towards. The very end sees them getting a sort of "happily ever after" where they can travel between worlds freely, their family reunited and safe. It felt like a definitive conclusion to their main arc.
As for a sequel, Chris Colfer has written related books but not a direct continuation. 'A Tale of Magic...' starts a prequel trilogy about the origins of Madame Weatherberry and the Fairy Council. It's set years before the twins' story. So if you're asking if Alex and Conner's adventures continue, the answer is no, not really. Their story is finished, which I think was the right call. The prequels are interesting for lore, but they're a different vibe.