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.
Pastwatch: The Redemption of Christopher Columbus by Orson Scott Card
I’m aware of the issues with OSC. But I still like this book. >!Go back in time to prevent Columbus reporting gold, and giving the Indigenous People a few more years to prepare for his arrival!<