To use customer reviews to improve ecommerce marketplace sales, actively gather and display reviews on your product pages to build trust and credibility. Analyze feedback to identify common praises and complaints, then address these areas by enhancing product quality, refining descriptions, or adjusting prices. Responding to reviews shows customers you value their input, fostering loyalty. Incorporate positive testimonials in marketing materials to attract new customers. Regularly monitor reviews to stay attuned to customer needs and trends, enabling continuous improvement and increased satisfaction.