the fourth quarter of the year normally determines whether that year is good or bad for the crypto market. if you look at the last year 2017 the cryptocurrency market started booming in the early October while nothing good happened in the last October yet the market is crashing very badly in November. i guest this year is not the good one for bitcoin and the cryptocurrency in general.
Cryptocurrencies has a lot of issues, especially their regulations and the behavior. This is why this things are happening right now, no one can determine why such value keeps on decreasing and this is the danger to take note. Probably this year isn't good for them and we should need not to worry because there is still another year to wait and maybe by next year we can see a better value.