From Elf Reincarnation to Cheat Kingdom Founding Chronicle

A brilliant magician discovers a way to reincarnate through magic he created, hoping to escape a fate of dying naturally in old age. After repeating the process many times, he is reborn for the 31st time as Syril, a boy in an elf hamlet ruled by humans, where elves are treated like animals. At fourteen, Syril regains the knowledge and experience of his past lives. He takes action to help Lucie, his childhood friend, and begins building a village where people of every race can live together. Their settlement marks the start of his effort to establish an ideal nation, alongside fox-girls, elves, and other heroines.