One thing I love about e-commerce companies is the let me know when a product is back in stock! I have used this feature many times and also bought something later.
Below you see an example from Tesla by Appikon.

Google Ads often counts existing customers as new, so you pay acquisition costs for retention.
Join the free webinar on June 30 at 14:00 CEST to learn how POAS, profit data, and real LTV fix this.
Bid for future profit not easy conversions.