I have a conclusion that may be true:
Due to there is a big drop in Bitcoin within this period. So I think the main reason for this crisis is that the capitalists ( who have a huge amount of Bitcoin) has sold a large proportion of their money, in order to decrease the value of BTC and the other currencies.
And their goal is to buy again Bitcoin and some currencies ( like, Ripple, Ethereum..) also they want to improve their profit rate in a long term .
What do you think guys?

When bitcoin has reached to 19K, many people (users) expected that this currency will have a brilliant future, but unfortunately, it went reverse all expectations and their price fell significantly to 9k

.
Now many expect that bitcoin will fall, therefore, it will go contrary to expectations and it will rise with a big quantity

.