idk the name

this guy reincarnates to different lives where he has to join the hero’s party and then be kicked out before he goes onto another world where he does it again and he repeats this 100 times before he ends up in this space with 100 doors leading to every one of his past lives. i forgot why specifically but he goes back to his very first life where he meets this dying elf mage girl that he used to be in the hero’s party with so he decides to go back in time to when he first met them.