I would suggest that you check the historical price of bitcoin dating back maybe 2 years or so and you will see that it is common for BTC to fluctuate. Given that it goes down dramatically if there is FUD like banning or regulations being implemented. Vice versa when there is good news. But as the saying goes, nobody can tell what 2018 holds for BTC. What we need is faith in the technology and patience.
In YourBlock2018 new year, bitcoin fell to the new year. Some people say, bitcoin is the rich's gambling game, whose financial resources are strong, who will last, who will win. But in the eyes of the ordinary people, this is just a boom bubble of false big space, which will break in the morning and evening.