So far it doesn't sound any stranger than some of the New Age things I have read. It particularly reminds me of things like Indigo and Crystal children, who are born here but come from other places. After the Crystals there were some other groups, like Rainbow (I think), that I haven't kept track of.

It isn't really a matter of if people believe you or not. The issue is of shared experience. Most people could look at a Starbucks and agree that it is a coffee shop, or look at a post office and agree that this is somewhere to mail a letter. If you want them to believe in other universes, you need someone who can experience them with you or they just won't be able to "get it". Which is not to say that I am such a person. I have had glimpses of something more, but never ones that lasted long enough to fully process what it was that I was seeing. So most of the time I can't even say I have shared experience with myself. I know I saw something but I can only really believe myself in the moments when I'm seeing it again. The rest of the time it just isn't there. See what I mean? It isn't about belief at all. I think what you are looking for is a way to help other people move beyond their limitations so you can share your experience with them. Personally I wouldn't suggest making it into a mission of some sort. Even people who want to help, to open up to new possibilities, won't know how to do it. Even the willing will be strangely resistant and they won't know how to let go so they can move into the experience with you. It has to be done gradually, to avoid the mental equivalent of a torn muscle. I know that people place limitations on what they perceive and that these limitations are not the same at all times; sometimes they can go a little bit beyond what they usually can. A gradual training is needed if you want someone to be able to break down their own barriers. The kind of perception you are describing isn't like a Starbucks or a Post Office; anyone can see them whether they believe or not. For what you are describing, though, they almost need to believe first and see second. It would be easier to start working with people you can meet with in person, on a regular basis. Start by looking into ways to get them to see anything at all beyond their usual beliefs. Chip away at the limitations a little at a time and when it is working you can begin to direct the process until you have someone who can have shared experience with you.

Keep in mind, though, that you are born here in this universe and on this planet. You wouldn't be here if there weren't some value to being here, for you. The ups and downs you will experience can provide an amazing ride, and it is important to learn to keep your balance so you don't get lost in it.