As a brand new god, why would you put yourself into a situation where you BECOME MORTAL?

Is it even possible to easily return to the divine realm?... or is he stuck in the lower world until he completes the hardest dungeon on the planet and gains the ticket to the divine realm? The story doesn't go into detail about this AT ALL
I could possibly understand if you had been a god for so long that you no longer cared about dying... but this kid literally just became a god a week ago.
Honestly he should have just created a way that lets him remote-control an avatar in the lower world without actually descending there himself.
Or even just a way that lets him share senses of a person living in his world. He wouldn't be able to affect the world, but he would get to experience the life of a typical person living there. You could use the lives you experience to make decisions for things to change about the world you created.