Recursion (2019) Blake Crouch
Check out Dark Matter, a terrific book about multiple universes. Recursionis another great read from Crouch that explores time travel. Not the typical simplistic plot where the hero(ine) solves their high school angst. Here the whole world predictably goes crazy when more and more people learn how to travel back in time and change history.
Helena Smith accidently designs the device that allows time travel to happen, but there are complications. People remember their previous lives. Oops. Barry Sutton gets involved as a detective investigating one of the many people who commit suicide when they begin remembering previous lives. These two team up to try and solve this mess. Blake Crouch takes things to the natural extremes and somehow winds it up again. More Please!