A valid fractal high or low is established only after the close of the second candle following the formation of a tentative fractal high or low.
Here's how your entries would look on a one-hour GBP/USD chart.
Each yellow arrow points to the best possible buy (or sell) entry, based on the fractal which formed 3 candles previously.
The dashed yellow lines connect the fractal highs (and lows) to the sell (and buy) signals which they triggered.
You haven't outlined a complete system --- what are your exit rules? what about stop-losses? etc. --- so, it's impossible for anyone to evaluate the potential profitability of this idea.
Just looking at the buy/sell entry points dictated by this system, I don't think you have a winner here. For one thing, you have 6 buy signals and 4 sell signals in a downward trending price pattern.
However, until you can put entry and exit prices on all the signals generated here, you can't determine profitability.
- Risk is the Price we pay for Opportunity -