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.
The Chronicles of St Mary’s by Jodie Taylor, the first book is “One Damned Thing After Another” - historian’s using time travel to do proper first person research. It’s a time travel action adventure comedy with great characterisation and a spin off series.
The Doomsday Book by Connie Willis. 100% one of the most interesting books to read during the pandemic although it was published in 1992. In some near future, a historian from Oxford university time travels back to the black death in the medieval period but gets stranded because a pandemic begins in Oxford and all the people who are qualified to work the time machine are either deathly ill or prevented from entering the city due to quarantine. It’s a fantastic study in human nature, how two societies dealt with terrifying and untreatable infectious plagues and hands down the most absorbing and credible story of living in a medieval family/village/society. One of my favourite books ever and really prescient about how we dealt with pandemic life, even down to the panic over toilet rolls! Maybe the author herself had a time machine??