If you define long-term investment in this market, investing in Bitcoin at this time is very appropriate because I believe that the market will grow strongly in 2018 and early 2019. Bitcoin will also grow very well if the cryptocurrency market exists and grows.
I also think that BTC is going up next year. But I can't wait for this moment. Every time it makes me happy when I see BTC green on coin360. I understand why people are moaning about btc - they just bought it when it picked $19k and now regret it. NOW is the time to buy crypto