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.
I saw on google the bitcoin price historical data.
Nov. 29 ,2013 exchange rate peaks at $1242 on Mt. Gox
Feb. 2 , 2014 dump into $717. Major Exchanges Hit with Ddos attacks.
Feb 24 2014 continous dumping at $547 Mt. Gox closes.
April 10 2014 deep price $408. Chinese exchanges bank accounts closed.
Oct. 06 2014 $323. The slaying of bearwhale.
2014 to 2016 very volatile price of bitcoin.
But Nov. 9 2016 will rise the price of bitcoin at $726. Donald Trump elected as president,market Plummet.
Whole of 2017 bitcoin is profitable. Well see the future of 2018 what happen to bitcoin. Nobody knows when price of bitcoin will rise again.