@Legion_01 Time travel to the past is only one iteration of a broader "omniscient viewpoint" genre that suffers from the same problem. Villainesses who have cleared the otome game, readers who finished the book, all the same, all equally boring.
I'm not saying that this premise
cannot be made good. When the protagonist has only incomplete information, for example: the only villainess story I follow with actual interest (there are a couple I follow for the gags without caring much about the plot, but I normally drop these after a while) is
Death is the only ending for the villainess, precisely because she didn't clear the game before being sucked into it, so she has just a slight edge of experience from the dozens of death endings, and there's a lot she doesn't know and she keeps being surprised by events.
There's also the new one they started scanlating a few days ago, where the guy goes back and forth between past and future and needs to change an event the background whereof he has only fragmentary knowledge of. Then we can feel the real challenge posed to the protagonist.