My pick would have to be the A Whole Nother Story trilogy, in which (spoiler warning) you can only travel back in time. But because time is in a loop of sorts, if you go before the beginning of time, you will be at the end of time. From there you can go back to any time you want to. And time paradoxes cannot be produced. Plus, your memories from the previous timeline exist as well as the memories from the new one.
Telling someone it’s a book about time travel is almost spoiling it, as it’s super weird for the first half with no indication of time travel. But otherwise yes, this, one of my favorite books ever and my #1 Palahniuk book
True. And same.