if i had a nickel for every time i read a series where the most powerful exorcist was killed and he reincarnated in another world where he was looked down upon for his low magical talent, but his exorcism powers made him the strongest anyways, i'd have two nickels, and that's fine with me
second one is alternatively titled "reincarnated as a son of an aristocrat"
https://myanimelist.net/anime/50932