Many investors have invested bitcoin in recent months and started selling it because of panic sell, it's natural that we see the bitcoin prices are dropping nowadays. For the next few days bitcoin is needed so it can go up in a short time so that To reach 19000 USD can take time which is not so long for the bitcoin to be stable again.
Today, nine years after the invention of bitcoin, most people do not understand it, and even are full of misunderstanding and slander. There are many reasons for this kind of result. For example, people often exclusion psychology because of ignorance of new things, some self-righteous experts flicker, government regulation and repression, negative media coverage and so on. And these will cause bitcoin price fluctuations.