The first thing you need to know is Bitcoin is an experiment. Its inventors warned that don't invest money in Bitcoin that you can't afford to lose.
The lack of applications for the Bitcoin, cryptocurrencies in general, has made it very unstable.
Still, there are not many ways you can use Bitcoin. That is why the sharp hikes and declines in the value of Bitcoin. It's totally unpredictable. The government laws in various countries and inventions in the cryptocurrency and blockchain technology may create a huge impact on the value of Bitcoin. We don't know what happens when. It's controlled by lots of external factors we have no clue about until it happens.
Cryptocurrency platforms like ECOINOMI
will stabilize the value of Bitcoin and other cryptocurrencies. But we can't expect that to happen until the mid of 2019.