With respect to what created the universe, the question what came before that doesn't have a satisfactory answer as it leads to an infinite regression of what came before that.
So the only solution to the first cause conundrum of what came before that is "no thing" because only a "no thing" can be eternal and unchanging. The reason only a "no thing" can be the solution is because "things" change. Matter and energy equilibrate. There's no stopping it. So matter and energy itself can not be an eternal source of creating matter and energy. It just isn't possible once you wrap your mind around what eternity or infinity actually means. Not to mention that the mere presence of energy and matter literally creates space and time. It's own space own time. Separate from all other space times. There's no getting around this either.
So it is not possible for some "thing" to be an eternal source of creating universes.
So the only solution to the first cause conundrum of what came before that is "no thing" because only a "no thing" can be eternal and unchanging. The reason only a "no thing" can be the solution is because "things" change. Matter and energy equilibrate. There's no stopping it. So matter and energy itself can not be an eternal source of creating matter and energy. It just isn't possible once you wrap your mind around what eternity or infinity actually means. Not to mention that the mere presence of energy and matter literally creates space and time. It's own space own time. Separate from all other space times. There's no getting around this either.
So it is not possible for some "thing" to be an eternal source of creating universes.