As long as I enter the world of Cryptocurrency, I also have not been able to find a definite reason for the rise and fall of the price of Crypto coins, maybe someone is controlling it or just traders who make coin prices can go up and down.
In fact, often the price of coins changes very dramatically and can make coin holders become rich or lose. It is truly that the change in the price of Cryptocurrency is a mystery, because no one can predict for sure.