Sometimes a business requires lateral thinking to expand. Concentrating all your effort in one area of growth may seem logical but if you do so beyond the target market available for your geographic region, in the case of a service business, then you have no more good potential customers for your current service.
It is time to alter your offer to include new or value-added items to entice new customers. This requires some insight and legwork. Companies willing to experiment on a small scale may actually discover a large, untapped market for their services, if only slightly altered.