The reason is uncertain, but it may be that market saturation and fierce competition led to low sales, or the platform's algorithm adjustment led to the store being demoted. Further investigation and analysis are needed to find the exact cause. In order to increase sales, you can try to add more promotional activities, provide more competitive prices and services, and pay attention to store maintenance and marketing promotion to increase store exposure and credibility. In addition, you can also consider expanding into more potential markets and strengthening product innovation and optimization.