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.
Man in the Empty Suit by Sean Ferrell.
A time traveller goes to his own birthday party - every year. So the book is, mostly, the same party, over and over again, with him there at successive ages. And there is, of course, a crisis point which happens at a particular age, and so all of his younger selves don’t know the details, but the older ones do.