it seems like a price increase like last year is impossible to repeat again this year, yesterday the price of bitcoin dropped very far and that made many investors increasingly frustrated. this makes the price of bitcoin very difficult to rise.
There can't be a parabolic rise every single year. This year needed to be bearish due to 2017s insane price upswing. Don't be frustrated because this year isn't looking too bullish. If anything, a bearish year is good, as that gives you time to accumulate. A bearish year with Bitcoin is usually followed by a bullish year, so if we don't see any bullish action by the end of the year, that just means 2019 will likely be that much more bullish. The time to buy is when people are thinking of selling.