When the Lord God Almighty sees that the earth is completely cleansed, he will have the option of doing only one of two things. Either he can install the Lord God Father in Heaven as the doorkeeper, or he himself can become the doorkeeper.
If he becomes the doorkeeper, it means that he will no longer be the Lord God Almighty, so it is unlikely that he will become the doorkeeper. The Lord God Almighty is El Shaddai, and El Shaddai is the Lord God Almighty. The Lord God Almighty is infinitely wise.