Trading requires entries similar to how a computer would enter positions, what I mean by this is entries should be so disciplined it hurts, when you are sitting there bored in the early hours of the morning and you take sloppy trades this has an effect on your results! you should create enough discipline to be able to trade a specific time frame when your entry and exit system provides better returns. Adding rules for confirmation will also lead to better entries, things such as a Baseline, what this will do is create a layer of the bike lock, now you never take buys below the baselines, meaning you no longer take reversals, your winrate will improve and your profits improve. For GBPUSD it is wise to trade over the London session and you can see just how much the pair moved over this session, your trades have a better chance at delivering profits in this zone. You may find your strategy works well in other timezones, and I suggest following the path, dont be restricted if it works elsewhere, but get some good backtest results.