Question

How do you get into a parallel universe?

Answer 1

From science fiction to science fact, there is a concept that suggests that there could be other universes besides our own, where all the choices you made in this life played out in alternate realities. The concept is known as a "parallel universe," and is a facet of the astronomical theory of the multiverse.

So far, there is no known way for you to do that because human physics can’t deal with any other universe let alone ours.

Do not despair. Parallel universes are likely to exist but don’t ask scientists for the answer. Instead, look to science fiction writers who know lots more about the multiverse than scientists. After all, scientists need PROOF and there is none so far.
so it is possible in our dreams not in real time
hope you got it :)