If I tell you why something exists rather than nothing is something that we can understand by looking at what something is. Because if something exists now, if something exists today, there cannot be a time in the distant past where there was absolute nothingness.
Because absolute nothingness has no energy, no potential, no quanta, no fluctuation, no hadrons laptops and gluons,
Because of absence of everything means something that exists today could not come from nothingness. That means there has to be always something. Something has to exist always. Now here, we have to now understand what that is then.
If something exists always, there is no beginning of that something. That means that’s something that made our universe, a self-aware, possessors of energy, and will and knowledge.
Because if that something that existed always didn’t will and bring this universe through His power into existence, it will never happen.