we dont know whats beyond what we can see, maybe the every piece of matter the universe connected to our observable universe is just the result of one big bang, and that so unimaginably far away another big bang happened, then once that universe is out of energy, everything there slowly falls back into one point, making the next big bang, or it could just be ours, its big, unlikely infinite, but big enough to be impossible to explore even if you lived forever

its like trying to find a blue sand particle in a sun sized mass of sand, we barely have looked through a handful of sand