bitcoin slowly went down this year, from almost 20k USD last December and went down at a significant price
what might be the reason why bitcoin's price is going down?
what are the major things that can greatly influence bitcoin?
answers would be fully appreciated

In my own opinion, the only reason for the prices to be affected is due to the people who are selling their coins whenever the prices are dumping and because of that the chain reaction is occuring which leads for the price to decrease even more.