For me it is because of the scammers, last year a lot of scammers enter bitcoin and put some investment in bitcoin that's why bitcoin price pump. They are getting a lot of multiple investors and put the investment with bitcoin so that the price of bitcoin will improve and the big investors will put more money and invest to them more which is, they actually didn't know that it is a trap. After scammers get profited, they run away and get all the investments they get to those multiple investors. That is why bitcoin price gets low as fast as how it also grows last year. Now, a lot of big investors are not trusting bitcoin again.