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.
If I Never Make It Back.
Dude falls asleep, wakes up and finds himself near Cincinatti in the late 19th century. He loves baseball and ends up joining the Cincinatti Reds ( the first pro baseball team) and also introduces the hamburger to the concessions at the ballpark. there’s also a bit about a black cyclist and racism.