The longer-term target for an is usually the pattern’s low. In the case of the GBPUSD , that would be the March low just above 1.2100. However, keep in mind that a move of that magnitude would take several weeks if not months to play out.
But sellers first need to secure a daily close below the 1.3020 area. Without that, the pound sterling will likely remain range bound between 1.3020 support and 1.3250 resistance.
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