I was summoned to an unknown world to defeat the Demon King, but my level seems to be very low when compared to the others that were summoned with me... Wait a minute, my occupation is "God?"
Old man gets summoned as a young hero, not understanding his power. A different take on the usual isekai, there's not much of it right now, but what I did read I really liked. Similar to https://www.anime-planet.com/manga/tatoeba-last-dungeon-mae-no-mura-no-shounen-ga-joban-no-machi-no-shokudou-de-hataraku-nichijou-monogatari