The current trend of Bitcoin is quite volatile. It increased by around 600% in 2017. Of course there is a chance to jump in that level in this year. Every time the price falls , right time to invest in knocks the door. I have another level of trust on this specific currency.
Volatility of Bitcoin is explained by its speculative nature. If speculation runs rampant this year as well, we may see the price grow a few times but volatility will be there too. And it is not set in stone that it will decrease with prices rising. it would go down only if real adoption increases. Right now it looks more like that it shrinks, not expands.