NONE.
There is no way for us to stop those rich people or institutional investor with what they are doing.

There is a famous quote that says "If you can't beat them, join them". What we can do right now is to just ride the waves, set a target sell price and wait after selling. Crypto market is a decentralized market where anybody can buy anything and there is no way for us to stop them. They are a group of rich people and they have a lot of money obviously. We Average Joes can't stop them from buying Bitcoin.

I know that these institutions are buying huge chunks of Bitcoin everyday and the chances of it being manipulated is going higher but there is nothing we can do with it but to be ready if in case the worst case scenario will happen.