Well, if you look at the chart in the last 6 weeks there was an almost exact same pattern, bitcoin dropped down to about $6,000 and then doubled to $12,000 over a couple of weeks. There is definitely a recurring pattern to bitcoins price changes, but I don't think these patterns drive future patterns.
That's right, if we look at the Bitcoin's price historical Chart then we can see this repeats many times "down in the begin of year and increase in the end of year".
In the begin of year, there are always two big events:
1. News years of Chinese and some Asia countries ;
2. Tax Day of United States.
Two events always affect to the crypto market because investors usually sell Bitcoin or altcoins which is holding to use for individual demand like: shopping for New Year in China and taxpayer in United States. So that will do the price of Bitcoin and the crypto market goes down. And then investors will go back the market on end of april, this will do the market go up again.
So i believe the price of Bitcoin will soon go up on May until end of 2018.