in my opinion 2018 really a lot of surprises.
Any currency or item that has a speculative value, usually always gives a surprise, whether it's because its value's decreased or even vice versa, everything isn't known because the market is difficult to predict.
OMG! btc prices continue to decline, most likely the price of other coins also decreased.
we need improvement in the face of this situation.
Such conditions, requiring us to use the most ancient strategy, namely BUY and HOLD no longer an effective strategy other than that.