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.
Nothing beats Reboot by Ken Grimwood. His life time loops every time he dies but every time he starts a little older until he finally has no time left.
Then there’s The Man Who Folded Himself, also known as the Man Who Fucked Himself for fairly easy to guess reasons
Finally JoJo’s Bizarre Adventures: Stone Ocean does a wild time travel thing that is a pretty big spoiler which is great because I don’t think I could explain it well lol