“after 3 days following the purchase we send an email offering them 50% off their next plug-in”

Send a 50% Off Email to Existing Customers Exactly 3 Days Post-Purchase

Katie triggers a cross-sell email at day 3, after the customer has had time to install and experience the plugin but before the initial excitement fades. The 50% discount lowers the barrier to a second purchase and turns single-product buyers into multi-product customers, directly compounding LTV across the portfolio.