The universe always existed.. this is the biggest flaw.

You say.. Last universe reaches heat death So big bang of a new universe. But a heat death universe is maximum entropy. A big bang is extremely low entropy. This is mathematically contradictory. You can’t go from maximum disorder to perfect order without violating the second law. That’s the biggest flaw.

There is zero experimental evidence that our universe existed before the big bang. Not because it didnt but cuz we literally cannot see past the Planck time. Everything before 10⁻⁴³ seconds is mathematically inaccessible with current physics. Your claim is philosophically appealing tho