Relic is a 2018 pastoral science fiction novel by Alan Dean Foster.
It is about a future in which humans have developed the capability to travel outside the solar system.
He is rescued by the Myssari, an extraterrestrial species, which wants to study him and use his DNA to recreaate more humans.
The aliens offer Ruslan a deal: if he cooperates with their genetic experiments, they will try to find the fabled first planet where humankind started.
Ruslan hopes he will get to travel to this planet, called "Earth", if it truly exists, and perhaps find other human survivors.