Most agencies get stuck in a rut where retainers cap your margins at 30...

https://dibz.me/blog/why-a-handful-of-european-seo-agencies-stopped-being-agencies-and-1138

Most agencies get stuck in a rut where retainers cap your margins at 30 percent. By turning internal workflows into software, you can push those margins past 70 percent. Think of your agency as a lab for building products rather than selling hours.