like December 2017, big sales for holidays and Christmas are one of the factors that make BTC fall.
i don't think you want to say what you are saying! "like December 2017" means price is going to shoot up from ~$8k to $20k? because that is what happened last year by the end of the year during Christmas time.
in my opinion, this December will have the same cycle with December 2017, so that BTC will fall again to $ 1500.
why? and how did you come up with that number? do you think bitcoin is some pump and dump shitcoin that gets pumped from $1000 to $20000 and then dumped back down to its initial value? because that is what bitcoin is going to be considered if we reach that low a price!