OMG! btc prices continue to decline, most likely the price of other coins also decreased.
we need improvement in the face of this situation.
in my opinion 2018 really a lot of surprises.
Yes, you are right in 2018 is indeed a lot of surprises. Last month the price of Bitcoin greatly decreased dramatically but this month seems to have started to improve again. I do not know the next month's Bitcoin prices will continue to grow or vice versa. And the price of Altcoin depends on Bitcoin.
In 2018 anything can happen to the Bitcoin price because there is a constant or regular change in the market of Bitcoin and the value alters with the change in demand and supply rule. The value is totally unpredictable and we can not predict the accurate value of Bitcoin for future due to these ups and downs of demand graphs. But the average demand price tells us the average future rise. We are wondering at the market value when the rise will happen and we start to sell at the end.