Maybe we are viewing it inside out and the expanding phenomenon isn’t driven by expanding towards the outer limits by energy of big bang, but rather being drawn in to an infinitely small center by a black hole.

Found this https://en.m.wikipedia.org/wiki/Black_hole_cosmology

... Or, the Big Bang was a supermassive white hole that was the result of a supermassive black hole at the heart of a galaxy in our parent universe

The observable universe isn't a black hole, and we're pretty confident of it, people keep making this observation every few years. There are some interesting analogies between our universe and a black hole, but they're mostly just general concepts that occur all over the place.

For example, we can create little analogue black and white holes in optical fibres, they even have the same horizons and similar governing equations, but they're still not black/white holes. You can honestly get the same effect by just being a bad swimmer and getting in a fast moving river.

This is roughly theoretical physicist Lee Smolin's fecund universes theory. That on the other side of black holes are other new universes and that our own is the other side of a black hole from a parent universe, etc.

The thing about a black hole is that the singularity is actually a forward point in time relative to the outside.

Space and time are the same, so in a space where space is bent so hard that everything falls in, time is likewise bent wildly out of shape.

So basically what this would imply is that the big bang is the point at which the black hole finally exploded and unleashed the built up matter that all reached finally the singularity point at that instant.