The podcast "Tides of History" has had some very interesting episodes on the Bronze Age Collapse.

Episodes 111-114 were pretty great and on topic. Episode 106 also directly addressed the question. It's a great series.

https://wondery.com/shows/tides-of-history/season/4/?epPage=12

You cite three certain cultures separated by long distances that place the hands of their statutes on their bellybuttons or over their genitals.

Why on Earth could such a coincidence occur? Um, because genitals and the belly button all have to to with new life? Or the physical constraints of the stylized nature of the artworks meant there was no other real place for the hands to go. I don't know.

What I do know is that if you really want to engage with your question, go into the archeological scholarship, not reddit. Asking the question here is just a bad faith way to push your pseudoscientific hogwash.

How many places are there to put a statue's hands? If the arms are not separated from the torso, the hands have to go on the torso as well.

Hang your arms against your torso. Where do your hands end up? Right at the level of your genitals. Is this remarkable?

Are you asking this question because of that Netflix series?