I'm still learning, but what I would then watch out for is the Wm%R dropping back down below the 20 and the CCI dropping below the +100. If I were trading that, I would probably have sold right around 6pm, not knowing that the chart would spring back upward right before 6:30.
But yeah, I think that's why it's best to make quicker and more frequent trades. Lock in profits while you've got them. The price may spring back to life after a short correction/consolidation, but who knows when? Perhaps as long as the EMA(9) stays at the top of the rainbow (or bottom, if shorting), that's also an indicator to stay in? As in, once it crosses below the EMA(14), that's your confirmation to exit (along with the dropping of the Wm%R and CCI).
Maybe?
That's just how I read it. Simple may have an altogether different method!