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.
I just finished Before The Coffee Gets Cold and I love how time travel is approached there! It’s such a different take from all the super complex wormholes seen in sci-go given the rule that you cannot - no matter what - change the present. I also love the message that it passes on, to cherish what we have now and understand the delicate circumstances that led to it.
Beautiful little book