Okay this is what I got for now. As from my chart analysis, I see that Bitcoin has been making 45-50% drops after every local top, 20k included.
From our recent local top, approx 10k, we are hovering at 6600-6700 at this moment. If we were to predict more blood here, the 45% drop avg. would bring us to 5500-5600ish which lines up with another historic support level. (Shown on chart)
Make your own assessments, just thought I would throw this out there.