The reason of falling down market is that their are many invetors are selling/trading. It is also like the supply and demand if their are many buying then the supply is becoming few but if there are few who are buying coins the supply is many. Also some are panic buying and panic selling and they are not into volatile of the market they lacked of knowledge on how to manage the prices of the market and how to play with the price so that if the prices in the market changes they will not pacnic because of the fast changes. If the investor is not into the volatile then they are not for trading because in trading you have to monitor the prices from time to time like if they buy BTC at $4000 then they plan to trade it they have to monitor the price because if the value of the BTC becomes $5000 and up they can trade it right away.