You've broached a philosophical subject at this point. It can be framed in many ways, but the underlying thread remains, "Is this real?".

Are we in but one of infinite simulations? Are you the only "real" person in this current simulation? Are there infinite other universes and realities for every permutation of existence? Are we all just God playing that they're not? Does dying simply awaken us from this reality as it does from a dream?

We're fast approaching a point at which we might be able to personally explore these questions. Where philosophy becomes reality.

Ultimately it doesn't change much for me. I certainly don't think we are in the first simulation or base/original world, if such a thing could even be said to exist, but there are few benefits that I've been able to surmise, from operating under the assumption that our existence is less real or simply one of many.

Fun to think about though, and it can help to take the edge off if this current reality becomes unbearable.