Last three major retracements (30-40%) all occurred after two all time highs. My guess is we'll see the pattern repeating. BTC is currently in the progress of making its second ATH, and after that we might see a 30-40% retracement.
Note
I cleaned it up a bit, added some lines and some price forecasts, but I don't know how to update the original idea. Made a new one here: 
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The information and publications are not meant to be, and do not constitute, financial, investment, trading, or other types of advice or recommendations supplied or endorsed by TradingView. Read more in the Terms of Use.