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Perhaps, David, when you first launch that product, it has a high demand, but after a while, that demand declines. So, you have to try to find out the reason behind the drop in search volume. Determine what your top competitors are doing to increase sales. Or there would be some more keywords for which your competitors are getting sales. So try to find these keywords in order to sell them, or target your top competitors in your campaigns in order to sell to their customers.
