Many people miss the year 2017 December 16 that bitcoin reached $19,343.04 but now bitcoin is only $6,497.37 so the question of this how we can help Bitcoin to get back to its price again ?
As you write, many people missed December 2017, but they also missed the years before the bitcoin was $ 250 and then for $ 1100 per month. That was about 2014 or the end of 2013. From my point of view nothing terrible happened, history is repeated. Of course people who bought for $ 19,000, i can only recommend not to sell and take it as a long-term investment. And what can we do to increase the bitcoin price ? Do not just sell at the current price. New incentives will come, and new investors, there will be countries where the bitcoin will be traded and it will start the btc price again.
I think that the price of bitcoin will remain the same atleast till the end of this year. In the next year the atmosphere may change and people may put their money in bitcoin, but in current situation we see big dip in the price. The whole year of 2018 is very bad for bitcoin so far and hopes that the next year will be good for growth. Just hold your coins for some more time.