Maybe it's pessimistic but the truth known to us is only part of the truth we are able to know. The universe, or, multiverse, might be beyond our wildest imagination. Science has shown many things about the world we live in. The JWST makes us see even further. But, what we can know, what we can see, might ultimately be limited to our settings (or, biological composition). There are certain things that we can imagine but cannot observe, such as multi-dimensional space; there are some things that we cannot even imagine, e.g., what is the other side of a black hole, if there is such a side? There might be eternal mysteries, e.g., anything beyond the observable universe, who knows?
Public access site for The Wilkinson Microwave Anisotropy Probe and associated information about cosmology.
wmap.gsfc.nasa.gov
What does this mean? It means that the universe known to us is merely a tiny part of the whole. There are things we can know, if not now, then in the future; and there are things we cannot, regardless. Maybe, in dark energy many creatures exist, but is this true? We don't know yet. We haven't found aliens yet, but perhaps they are already among us, perhaps they are everywhere, but we cannot find them. They exist in another dimension.
Life is like a never-ending exploratory journey. We can never know enough. That makes life so exciting. The beauty of the universe lies in its mysteries, infinity, and constant change.
The multiverse exists, in the sense that the infinitely small, quantum world, shares a similar structure as the infinitely huge, universe, as we know it. Perhaps, if they share the same principles, by knowing the quantum world, we can know what is currently impossible to know - the universe and beyond. Everything is interrelated and interdependent.