I won't lie, I saw this drop incoming, I sold near $50k's and bought back at $32k, then sold at $64k in Nov.
The chart pattern which was forming was double top with bearish RSI Divergence in which RSI is was going down, Price was going up.

Once it came towards $48k, I was able to see it forming another similar pattern which happened in 2018 that it will touch $22k.
So I bought at $21.5k for 50%, and DCAing the rest 50% throughout the year.