It is true that 2018 is a mainstream year, with a very long decline in bitcoin prices and but bitcoin already has a high price and I think it will increase again by the end of this year.
I agree with you, 2018 is a mainstream year because the movement of the price is unpredictable, and there's a large loss in the market. In the statistic of the market, a lot of red candlesticks are in there, and I think that it went mainstream because of its price went $20,000.