How many recovery emails should I send?

As a Shopify store owner running Facebook and Instagram ads, I'm constantly battling cart abandonment. I've noticed that while my traffic looks great, a significant number of potential customers add items to their cart but never complete the purchase. I'm wondering about the optimal email recovery strategy. Should I bombard them with emails? Or risk being too passive? My current approach feels scattered—sometimes I send one follow-up, sometimes none. I'm spending good money on acquiring these visitors, and watching them slip away feels like burning cash. My team keeps telling me that recovery emails are crucial, but no one's given me a clear, data-driven playbook. I need a systematic approach that feels professional, not desperate. My primary goals are to recover lost sales without annoying potential customers, maintain brand integrity, and maximize my return on ad spend. I'm looking for a strategic, intentional method to re-engage these almost-customers and turn those abandoned carts into completed transactions.