Reborn a magical son

Aryan suddenly gets reincarnated into a different world, and the reason for this was a deity's mistake. In exchange for his unexpected death, that deity gives him a new life in a fantasy world filled with swords, magic, and demons. But the problem was that this world was still stuck in medieval times—no electricity, no proper plumbing, and none of the technology that Aryan was so connected to in his old life. Will Aryan be able to change his life...? What will his journey be like...? We will learn in this story...