'Go with the flow 3' (Serious One) = Need EA programmer to code this

I know that ‘Go with the flow 1 & 2’ are based on luck strategy, more like gambling, but now ‘Go with the flow 3’ is more serious one, I promise. check this out, you all are welcome to give comment and idea, more brain are better than one!

Use the attached indicator and change the colour, above blue and below red

TF & PAIR = I think H1 & GBPUSD look more profitable

Buy Entry: When the candle touches the blue line, exit when the candle touch the red line.
Sell Entry: When the candle touches the red line, exit when the candle touch the blue line.

If you back test it, some gave false signal where when it touches the blue line (buy) it reverse and touch the red line. So to avoid big loss, I think there should be a SL put under the first candle that touches the line. What do you think?

you can also add EMA 21 for early exit