As for the volatility of bitcoin coins - very high. But take a graph of the growth of Bitcoin for the entire period, at the beginning of the journey there was a constant growth, then it constantly fell. There are waves in nature - there will be a big climb, but when it is difficult to say. Maybe soon, this year, or in 2019, let's see. Investing in digital coins is a noble and risky business.
The fluctuations of Bitcoin's prices let the traders earn their money. However, in October BTC volatility is very low, and it is better to hold the crypto than to trade it.