This article shows how acquisition, conversion, and retention work as one...

https://wiki-dale.win/index.php/Discount_Campaigns_Drive_Sales_but_Repeat_Rate_Drops:_Why_It_Happens%E2%80%94and_What_to_Do

This article shows how acquisition, conversion, and retention work as one system. Compare CAC with AOV, then track repeat purchase rate and CLV to see if growth pays off. It also covers tools with plans from $199/month.