Do you believe there is a multiverse?

Definitely. And you would too if you ever read The Rime of the Ancient Mariner. Samuel Taylor Coleridge (1834).
It has so many verses you forget what the beginning was before you get to the end.

Nope. I presume that you mean a multiverse of this universe.
I think that there could be other, different universes, though.

I don't know. It's possible I suppose. I'm still trying to get my head around us not even knowing what 95% of this universe consists of.

maybe, so many possibilities

Not at this time. I believe it is possible but have not had sufficient evidence to adopt it into my belief set.