If I had 300 million, I wouldn't think so simply. The dealer's game.

I am wondering if I am a shark holding crypto assets of about 300 million $ , can I manipulate the price of any coin at a short moment?
For example, I set a LONG order for XRP x30 and I spend 300 million $ to buy XRP, then the price of XRP will rise and I can make money from futures with the LONG order and also from the amount of XRP I just bought, if the system does not prohibit such actions, then I can buy and sell with other types of coins and profit from that. Do you think so?