Bitcoin reach almost 20k last year and gone down to 6k this beginning of 2018.
People panicked because of some random FUD - this is the reason price declined, but I gotta admit, this price spike has been too sudden IMO.
Some sort of correction meant to happen sooner or later.
People are panicking because of some countries are banning bitcoin and so-called experts causing a fuzz that bitcoin will not survive this.
Who is exactly banning bitcoin? Korea is fine with it, India said that they will monitor the situation of illegal use of BTC and Russia is insignificant here.
I think we are lucky for this year because bitcoin started small and I believe it will pump hard at the end of the year.
Historically, usually the beginning of the new year was bad for bitcoin, the price was always low, due to many reasons i.e. Chinese lunar year.
I believe this time will be exactly the same - just wait for it, BTW this is amazingly good time to actually buy more coins!