He creates with Consciousness.
First, He is conscious of a world, of time and space. And so, that world exists.
But that is not enough; for it exists, but it is not a thing of its own. Its only value is extrinsic—His consciousness of it from beyond.
So then He is conscious of that world from within. He judges, He makes distinctions. He says, “It should be like this and not like that. This I like, this I do not.” He plays by the rules of the game that He has made.
It is in this consciousness that a true world is born, a place that feels, “Yes, I exist.”

Shema Yisrael, Hashem Elokenu, Hashem Echad, One G-d, One world divided only because of the rule, "You will not see Me and live" until we become like him that is: Compassionate, loving, truthful and all that is mentioned in His attributes. Multiverse, I think not. One G-d, one world and He is waiting for us to get there.