I'm not convinced the Big Bang ever happened.
I think of it as a type of percolation.
Initially, there was a change from absolute zero to heat.
A point (one dimension) started to move.
That movement caused heat around it.
That heat then caused other points to move.
As the heat slowly rose, by products were formed.
Those by products attempted to solidify and freeze again but there was too much heat moving things around them.
The movement set wave fronts in motion.
Those wave fronts affected other points and the early Universe started to percolate.
As more points percolated they caused matter to start to form.
Fast forward to the present and space is still percolating.
That is why there is no directionality to space's expansion.
That's why we can't backtrack to find the location of said Big Bang.
We don't exist inside an explosion, we exist inside a percolation.
Our reference view is on the wrong scale to see it.
That's why we invent things like Dark Matter and Dark Energy.
That's why there is conflict between Cosmic Anisotropy VS Homogeneity and Isotropy.
If you think about it...
If there was a Big Bang that started it all, we would be inside the explosion. As we move thru time and space, we would see the direction of the explosion as some parts whiz past us and we whiz past other parts but all parts would be moving outward away from the initial explosion.
We would be able to track that movement back towards its source.
What we do see, at the limit of our ability, is that no matter which direction we look, we see galaxies that existed 14 billion years ago.
An explosion in space kinda looks like this...
It has specific structures within it that hint to its initiation point.
Space looks like this (Cosmic Microwave Background Radiation)
It is lacking a specific initiation point.
Just like the liquid in a pot of boiling water, there is no track-able initiation point.