You're likely capping out at 30 percent margins with standard client retainers....

https://www.easybookmarkings.win/most-seo-retainers-max-out-at-30-percent-margins-because-you-are-trading-hours

You're likely capping out at 30 percent margins with standard client retainers. When you turn your internal scripts into a simple tool, those margins jump to 70 percent plus. It’s time to stop trading hours and start running your agency like a lab.