Most agencies get stuck with 30% margins because retainers rely on headcount....

https://bizzmarkblog.com/what-mistakes-do-agencies-make-when-they-try-to-ship-software/

Most agencies get stuck with 30% margins because retainers rely on headcount. If you treat your agency like a lab to turn workflows into software, you can push margins past 70%. It is time to stop selling hours and start building your own tools.