Bitcoin sell off (the start of a head and shoulders)

Throughout my extensive back testing, I noticed that bitcoin likes to retrace to the 618 then drop to almost the 0. (Around 15.4% which is a 1/4 fraction of 618). Price 13,535 is the 618 fib level of the intitial push to the 19;518 price. The drop down to the 15.4% fib level of the over all move is also the 1.27 of the initial push up to 13535