I actually haven't been able to place the real cause of the sustained dip of this year 2018. I have heard several speculations and all have not actually aimed right. If you now say it is a price correction, I wouldn't fully agree as a lot of the token prices have been devalued really below their real prices.
It has been a crazy year and it is only november now, I can't think of what the 2019 year will bring us. The correction was definitely something we deserved, the price was just around 900 dollars and less a year before the skyrocket, nothing should go up from 900 dollars to 20 thousand dollars in a year it went up almost 23 times in price which is definitely not sustainable unless you keep pouring money into it at billions rate.
Of course it got corrected back into what it deserves to be and there was a lot of new people coming in during those times, some of them got in and just ran away when it dropped but some others stayed and amongst us right now which made the user base a bit bigger.
Thanks to those people and the rising transaction numbers causing miners to work overtime right now we have a bitcoin that worths over 6 thousand dollars, it is still a big increase from the 900 dollars two years ago but nothing insane like 20 thousand dollars.