Most of what works in the Star Trek movies evolve from what we know about the characters. Kirk’s love for his ship and history with the Klingons, Picard’s history with the Borg, Data’s struggle with emotions, that sort of thing.
What character threads from any of the series could have been picked up and expanded on in movies?
It would be interesting to see an exploration as to how Riker transitioned back to going back to progressing his career. TNG pointed out that Riker had stopped progressing his career when he went to the Enterprise. It would be interesting to deal with his shift to becoming a captain.