Agencies often get stuck in a service loop where retainers cap margins at 30...

https://www.red-bookmarks.win/stop-trading-hours-for-fixed-retainers-that-cap-your-profit-at-30-percent-when

Agencies often get stuck in a service loop where retainers cap margins at 30 percent. Start treating your team like a lab to build software instead. Once you turn your internal workflows into a tool, those margins can jump to 70 percent plus.