This is a normal fluctuation movement and nothing more in which fluctuating is part of the Crypto market that we should be used to it. Bitcoin price is proven unpredictable so i suggest that do not depend so much of some predictions of when it will bounce back as it might just to disappoint you again.
It`s normal and many traders wish for this fluctuations so they can earn a lot of money in short-term. 20% up or down is huge at current Bitcoin price,
changes are big and traders can make huge profit in weeks. Who buy at bottom and sell at top will earn a lot.
Not only dumps can happen all of a sudden, same is with price rise, all of a sudden price can start rising. If you can`t notice this changes than don`t trade,
is my advice to newbies. I don`t trade, I hold and I don`t care much about this sudden price changes.
People keeps asking question on why bitcoin dump, why smart traders keeps looking for the deepest it will get for him to quickly buy, because like you rightly said, traders makes money from these fluctuation, and from this recent fluctuation, do you know how much some people would have made during those time, because any time that bitcoin makes a down move, there is always a corresponding upward movement of price back and this is that opportunity that traders that does shorts use in either making more fiat or multiplying their BTC.
There is no market without those fluctuations, and those fluctuations are what really make the market an interesting one and what really attract people from Forex trading to it. For me, I trade and then hold, that is how I benefit from the market fully.