there is no such thing as "another universe". by definition. worlds are made of causation. if the "other universe" can have any effect on ours, it is part of ours, thus, it is not "other". if it can't have any effect on ours, it does not exist. "exists" means "is in our world"

universe. there's only one of it.

it's right there in the name.

there can be another really big bag of stuff, but it's not a universe.

the World is not an object. it is not a container. it is everything.

treating the World as an object is a category error with profound consequences

I strongly recommend integrating the Anthropic Principle into your understanding of what is going on in your day-to-day life.