This is a paradox. (And perhaps a paradigm or limit to our understanding?)

There can not be nothing because we can't perceive nothing.
So, you have two choices.

The dimensional reality we perceive must have either been made (from the nothing)...which we can't comprehend.

Or it must have always been, and is infinite...repeating endlessly, or somehow a motionless thing (existing outside of time) that was set in motion (requiring a prime mover..the Demiurge).

But what is the limit of the demiurge? Infinite and always in existence, or himself created from nothing by something beyond even that.