It makes no sense for it to be a simulation like a computer simulation. It’s a simulation like a dream is a simulation. Everything in the universe you observe is you. Waking up from the dream is realising this, and realising nothing exists, just being.
Like a dream, you are just me. The floor I walk is me. The air I breathe is me. Everyone I meet, everything I feel, is just me. Nothing is real except I.
I took about 10 hits of acid once and had a conversation with something that seemed to be "God" or a close approximation to it, and it told me something similar. It told me that everything is connected, that we're all one, that we're all of us different aspects of each other, or something like that. This was 20+ years ago and I was zonked out of my fucking head that night.