Bitcoin saw a golden cross of the 21 day EMA and the 50 day EMA on the 13th of January. This cross typically precedes a significant rally.
As shown in the related idea, Bitcoin entered a new bull market in December 2018. The current rally is the start of a major trend change as part of this bull market.
On the 19th of January Bitcoin hit major resistance, the .618 retracement fib and the 200 day MA.
Buying area is between 8000 and 8300 based on MA and fib support.