İf GREEN > YELLOW > RED > BLACK
UPWARD TREND
If BLACK > RED > YELLOW > GREEN
DOWNWARD TREND
In upward trend , if green(fastest ema) crossunder YELLOW or RED or both of them , you can close the position . Dont wait the Downward Trend.
Lengths of EMAs are based on Fibonacci numbers ( 8,13,21,34) , if you want, you can change it based on your strategy.