Crypto analyst Charting Guy (@ChartingGuy) warns of selling Dogecoin if certain Fibonacci retracement levels aren't broken in the coming months.Key Fibonacci retracements for Dogecoin range from $0.1397 to $0.76.Charting Guy plans to sell majority or all of his Dogecoin if it fails to break the 0.702 or 0.786 Fibonacci levels.The shift in sentiment comes as DOGE trades around $0.20 and follows a previous bullish outlook by Charting Guy.