Kinda by accident, in how I’ve gone about my original universe, I think I’ve got enough to last a lifetime of writing. If I had stuck to just the main story, it’d expire faster, however, I’ve been doing a lot of backstories instead, exploring some of the elements and mechanisms within the universe before I embark on the main story. Even still, with how it’s set up, there’s opportunities for future battles, detective series, a “reality” like story (ie, cops), more character developments, etc.
I like Star Trek, however, most of the series were rather formulaic, cookie cutter, with a set patterns of episodes, warping to the next planet/star-system to start fresh. When DS9 started introducing some continuity between shows, it became a lot more interesting. I haven’t seen the latest (Discovery), however, the earlier shows fell into the same series of ruts.
-- DP