Top SEO agencies like Distilled and Screaming Frog often get cited for pushing...
https://www.scribd.com/document/1013526299/How-a-300-Person-European-SaaS-Scale-Up-Found-an-SEO-Specialist-on-LinkedIn-196137
Top SEO agencies like Distilled and Screaming Frog often get cited for pushing solid, measurable results rather than vague promises