Agreed - I think "Serenity" from 2005 is a good example of a modern(ish) cult film. It was a follow-up movie to a TV show ("Firefly") that only ran for one season twenty years ago. It had a $39 million budget and only grossed $40 million, so it wasn't a commercial success at the time, but it's got an 82% critic score and a 91% audience score so there are a lot of people out there that enjoy/enjoyed it. And you can't go to a con without seeing people cosplaying the characters or selling related merch. Who knows how much of the popularity is from the TV show and how much is from the movie, but regardless - there's still an enthusiastic fanbase ~20 years later for productions that weren't widely successful when they came out.