That would be a great tagline!
I am going to ask what I believe the right questions are—and then I will even take a stab at answering them given our obvious limited knowledge.
Q. How many alien races with human intelligence or above are there in the universe, including other dimensions etc.
A. Millions.
Q. What basis do you have for drawing that conclusion?
A. The fractal principle—as above, as below. We have an amazing variety of life here on this planet. I believe that the universe will be “Earth at scale” with an incredible variety of life.
Q. What basis do you have for accepting the fractal principle?
A. It is beautiful, brilliant, perfectly complex—it rings true—and it appears to operate on this planet at different scales.
Q. Why haven’t we found this variety of life already?
A. I believe a few races have contacted humans already—but the universe is so vast and our current technology is very limited. Imagine a thousand more years of technological advance, a million more years. Right now we are walking on our lawn looking for tigers and can’t find any tigers—and so conclude that tigers are a myth of mystics and crazy people.