I've long thought that the years just after First Contact would be fascinating to watch unfold. All the advanced tech (besides the warp drive) came from the Vulcans/Romulans (Transporter, replicator, etc). We see none of how Star Fleet came to be, how the Federation came to be, now the Vulcans helped humanity progress for YEARS. After First Contact, the next thing we see is a fully developed Enterprise, with all the tech in place and understood. A lot happened between that's I'd love to see a show/movie explore.