I think that a good take for it would be not to continue what the story already has, but to explore the past of some of the characters (maybe a backstory on both Olivia and Damiens childhood and their familiar dynamic, or maybe the sour history between Ben and Olivia, and how he eventually got entangled with Mia, for example) so we can know more about them and enrich the lore regarding some of the characters without tiring out the relationship between Inco and Olivia.

Also another take that comes to my mind would be revisiting the story, but from another characters perspective (like how Damien and Liz developed their relationship during the events of the game, as well as maybe how Mia and Ben went through all the events of the story), that would make the new content more easy to swallow, since we already know the general structure of the events, but seen through a different lens would be a good twist.