The more investors, the more the prices will fluctuate, if the big players wil start to invest millions and billions, then the market immediately starts to grow, if people start to withdraw money, then the market immediately falls. The market is built on investments as well as other properties, but investments affect the key position.
This is a key factor in determining a rise in market value. Of course, the market needs investors more investors, however what matters most is the balance between the withdrawal rate and deposit rate in crypto. Investors can join with billions but once the withdrawal rate surpasses the deposit, the market can never see a rise. This is the main reason why crypto users must refrain from all panic causing news and topics capable of creating FUD.