Might be to late for choosing then - he looses some powers with every change.
maybe thats a plot twist . Maybe god wanted to see if they wanna sacrifice their powers to become human. Maybe after he is done becoming human he can tap into war demon power
Why did he have to convert himself to human, isn't being invincible good.I don't understand Xianxia script writers…
maybe he was the heavenly child born in sep 9 and once he become human he can start cultivation and can become strong once again but this time with all his senses