Most SEO agencies are stuck at 30% margins because they only sell billable...

https://blogfreely.net/murciajpvo/do-you-need-venture-capital-to-build-an-seo-tool-if-you-already-have-retainers

Most SEO agencies are stuck at 30% margins because they only sell billable hours. Start treating your agency as a lab to build your own software. Once you transition to product margins, you’ll easily hit 70% and stop trading time for revenue.