Having written 40-100 pages of a few trunked time travel books that are never going to see the light of day, you CAN do more with it.
It's just that besides simplish back-to-the-future situations where it's nice and clean, you basically have two choices>either becomes a fucking cartoon (Stuff like back to the future at least pretends to follow its own rules, this is where you say "Fuck that" and are using time travel for pure comedy),
which is great, but having tried it, it doesn't carry a 200 page book, so you have to do something short like the 3 minute time travel bit in this episode or short stories, OR,>Lean hard into your consistency rules and take your premise dead serious to the absolute logical conclusions
This inevitably goes full Primer quickly though, where even if what you got is cool when you draw out your entire plot chart, no one's going to care enough to REDRAW your plot chart from your book because it's so hopelessly confusing to get through the first time.
Mixing the two I thought was great, but it mostly doesn't work because turns out the audience for people who want >a book that's really funny-but-fast and loose with its plot,
AND, same book,>unfunny-but-clockwork-precise-hand-crafted storywriting
is actually far smaller than you think, and both sides are going to hate half of your book.