This story start out with the with someone being reincarnated. He is not reincarnated by a good god however, he is reincarnated by an evil god with a curse that only allows him to stay at, I believe, level 1. Also his maid turns out to be a couple hundred years old hero that has been waiting for him I believe.
This is Level 1 No Saikyou Kenja (AKA Level 1 Strongest Sage).
One day, Kijou Haruto was forcefully transmigrated and cursed by a god from another world. A world of swords and magic. In this world you get stronger by increasing your battle levels. But due to a curse, Haruto is unable to gain levels. However, due to a mistake by the Evil God, Haruto was able to obtain an inexhaustable supply of magic...