Here’s one way of retaining your digital customer?
For online retailers, subscription services provide customer retention, predictable revenue, and opportunity to use up-selling and cross-selling creating trust & loyalty with the brand that equates to high retention rates.
Research also quotes over 50% of ecommerce service subscribers have more than one active subscription.
Even though Retailers spend enormous money on customer acquisition, as per the research data, only 14.77% of all eCommerce customers are returning shoppers.

The Subscription Trade Association (SUBTA) predicts that by 2023, 75% of direct-to-consumer brands will offer subscription services.
Hence, Retailers should consider adding subscription services to their strategy to get all the above benefits.
References:
www.forbes.com/sites/louiscolumbus/2018/03/04/the-state-of-the-subscription-economy-2018/?sh=7154901953ef
www.business2community.com/ecommerce/digital-retail-ecommerce-marketing-trends-changing-game-2016-beyond-01637444
subta.com/the-new-e-commerce-transformation-is-subscription-based-and-coming-to-your-door/
www.mckinsey.com/industries/technology-media-and-telecommunications/our-insights/thinking-inside-the-subscription-box-new-research-on-ecommerce-consumers