What's the secret to becoming a $multiBillionaire ?

Having more than one billion nine hundred and ninety-nine million, nine hundred and ninety-nine thousand nine hundred ninety-nine dollars and ninety-nine cents. In USD.

Having multi-billionaire parents and waiting for them to die.

already being a multi billionaire to start with

Invent something dumb, and convince everyone in the world that they want it.

Invest heavily in the Chinese military. 😨 Give the Chinese whatever they want, and become a closet communist totalitarian.

Inheritance , lottery , luck , good job and investing prowess . Right place at the right time ( see luck) 😉👍🏻

There are many, not one secret. You have to start by knowing that. There are many paths one can follow to reach that point.

IDK. I'm still working on the first million.

Serious capability or luck - usually a solid helping of both.

To be part of the economic dictatorship

Buy low, sell high.

knowing the right people I guess

Easiest?
Marry one !

Not telling.