Looking back at 2017 the last good correction we had was from 5000 to 3000 usd (40%) where we made support on the weekly time-frame around 3600 usd.
BTC coming close to the 200 week MA and support zone, but I think the big even of 3000 needs to be tested before we can think about moving to the upside.
3K was tested before we had the massive exponential run-up to 20k.