SEO retainers usually cap out at 30 percent margins because you are trading...

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

SEO retainers usually cap out at 30 percent margins because you are trading hours for revenue. Use your agency as a lab to build custom software instead. Shifting to products can push those margins past 70 percent and stop the cycle of constant hiring.