best guess looking at some simple cycles,trendline and 50% retrace. Emphasis on "guess"
edit....I think it will do a 0.618 retrace most likely but the 50% is a decent marker
measured move (red arrows) supports
I hath found through many trials and forbearance that the chief virtues required of a man who is to be successful in speculation art patience,temperance,a strong condition,mental fortitude and a stout pair of gaskins (Sir Thomas Rambler 1624)