euro dollar going sideways

The euro/usd on the 4 hour chart. Don't know if I'll ever figure out this forex thing. So I go practice on a demo account.

The idea is to go long (buy) when the candles turn white and leave the valley crossing the yellow line and go short (sell) when they turn red crossing down the yellow line from a peak. Can it be that simple? Yes when it's going up and down. No when going sideways which it does more often.