What if it isn't a simulation but reality?
Einstein once said that "The micro cosmos is the macro cosmos". What if that were true? It would basically refer to the fact that we're not inside a simulation but that our universe is part of something much bigger, something not easily comprehensible.
We already know that although the knowledge about atoms and electrons is mostly correct there's much to them than simply a nucleus and electrons spinning around them, thanks to the expanding knowledge on quantum mechanics. We also know that some things cannot be destroyed, energy can't just "disappear" for example. If you burn a piece of paper then all the basic elements which made up the material are still there, but in a completely different form. Effectively maintaining those basis aspects which made up for the piece of paper or which were 'inside' them.
If we are part of something bigger, why can't it be something which is pretty common in the grand scale of things? So basically theorizing that we, in comparison, are so small that our universe can't "just" be destroyed by any external events.