Ant-Man 3: Everything It Needs To Fix About The Franchise
2. Focus On Father-Daughter Relationships
It sounds cheesy, but as much as a setting the series' tone apart from the others is important for attracting fans to the project initially, what will really get fans hyping it after its release is having a solid emotional core. This is especially vital for comic book films in general, as bombastic and otherworldly story elements lose their appeal quickly if it isn't anchored to something that we can relate to and get invested in as an audience.
The first Ant-Man did it perfectly, with Paul Rudd's experiences with his daughter lining up well with the Hank Pym-Hope van Dyne dynamic. Unfortunately though, moving away from this is probably one of the sequel's worst offences, almost sacrificing it entirely for the 'Save Janet' storyline.
Harkening back to this is not only essential for the story, but also provides a stellar opportunity to emotionally build on the events of Endgame because, as discussed in the previous entry, Cassie Lang is now a much changed person. Having Scott go on a journey to reconnect with his daughter should play well, especially when placing it alongside tensions that Hope and Hank had in the original, really bringing it home and closing out the trilogy.