Retainers are a constant grind that usually caps your margins at 30%. Start...

https://spark-wiki.win/index.php/Four_Dots:_How_a_Novi_Sad_Agency_Cracked_the_Code_on_Product_Evolution

Retainers are a constant grind that usually caps your margins at 30%. Start treating your agency like a lab to turn your manual workflows into tools, and you can easily push those profit margins past 70%.