Bitcoin future as of now is so hard to predict because of its performance nowadays. But I'm pretty sure there will be a high increase again next year, ( in fact it's always happened every year. but in 2019 not too much in my opinion.) And real talk it will not stay for long time again because of some causes, which is for sure it will collapse again after the growth rate bullish .
surely no one will know what bitcoin will become in 2019 later. but we all hope that that year will make the price of bitcoin and altcoin even higher compared to this year. Well, this year really made many crypto users panic.