/lit/ - Literature

>writing a duology
>first story introduces the characters and world but has its own ending
>second story is set after a timeskip and fully wraps up everything from the first story
>has its own ending which is my original intended ending and fates of the characters

However while writing I felt the need to expand the world a bit beyond what's depicted and strictly relevant to the duology's overarching story, and have potential material for a third story with the same characters (already have the major beats and ending in mind), but I'm not sure if I should add setup for the third story in the first two, and how overt it should be, just small background details or entire side plots that don't get wrapped up by the end of the duology

I feel like they might come off as loose ends and misdirection if I decide not to do the third story, and I even tied the fate of one character in story 1 to something that would only be relevant in story 3, should I just purge the first two stories of anything not relevant to the duology's ending?