From Elf Reincarnation to Cheat Kingdom Founding Chronicle

Synopsis:

A brilliant magician discovered the truth of magic to enable himself to reincarnate using a power he invented himself, fighting against his destiny to die a natural death from old age. The reincarnation cycle is repeated several times, and the magician's 31st reincarnation took the form of a youngster named Syril who lives in an elf hamlet. But the Elves are treated like animals in that village, which is governed by humans. After turning 14, Cyril, who has regained his prior knowledge and experience, takes action to assist Lucie, a girl who was a friend of his from childhood. That one village, where people of all races can live together, is where the tale of the establishment of the perfect nation starts. Fox-girl, Elves, and other heroines.