建立客户关系管理系统，定期回访客户。建立完善的客户关系管理系统，记录客户的购买历史、需求和反馈。定期回访客户，了解客户对产品的使用情况和意见，及时解决客户的问题。通过良好的客户关系维护，增强客户忠诚度。
Establish a customer relationship management system and regularly visit customers. Establish a complete customer relationship management system to record customers' purchase history, needs and feedback. Regularly visit customers to understand their usage situation and opinions of the products, and promptly solve customers' problems. Through good customer relationship maintenance, enhance customer loyalty.