Its a question that people have grappled with for millennia: Where did the universe come from? People came up with creation myths to answer it but didn’t have any concrete answers and its still the same today. While we have strong and well supported theories to explain things all the way back to 10-34 seconds after the big bang but from before moment zero to then is still a mystery.
So the question still remains but that doesn’t mean there are not possible answers.
But wait, scientists say that the universe, time, space and everything began at the big bang.
Well yes and no. When scientists say that time began at the big bang they don’t mean it literally. We have no information from before the big bang. All observable matter/energy, space and time as far as we can tell all originated in the big bang, we have no information about anything before it. This doesn’t mean there was not a “before” to the big bang, it means all information in the observable universe started there.
What was before the big bang? While we have no way of coming up with a solid evidence backed answers we can give possible answers and I will. Before I do, you need to remember: what I am about to say is purely conjecture. It has no backing in science and is (as of yet) completely unfalsifiable. Do not take these as any more than ideas and conjecture.