Most agencies get stuck at 30% margins on retainers because service work...

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

Most agencies get stuck at 30% margins on retainers because service work doesn't scale. Treat your agency like a lab to turn your internal workflows into software. You’ll replace the delivery grind with 70%+ margins and a product that actually scales.