Most SEO retainers max out at 30 percent margins because you are trading hours...

https://www.seo-bookmarks.win/retainers-are-a-treadmill-that-usually-caps-your-agency-at-30-percent-margins

Most SEO retainers max out at 30 percent margins because you are trading hours for money. Turn your best internal workflows into a simple tool and shift your focus to 70 percent software margins. It is the best way to scale your agency.