If clients are not buying your products (but they are buying others'), then perhaps your products don't appeal to them or compare well with competitive alternatives.
Symptom: We develop products in a technology-driven rather than market-driven manner.
Symptom: Clients don't perceive the strategic value of our products.
Symptom: Our products are difficult for our clients to use.
Symptom: Competitors are successfully selling equivalent products, but we aren't.