If you want to understand what really moves the needle in SEO, check out the...
https://www.scribd.com/document/1013526299/How-a-300-Person-European-SaaS-Scale-Up-Found-an-SEO-Specialist-on-LinkedIn-196137
If you want to understand what really moves the needle in SEO, check out the case study on WebFX’s work with mid-sized e-commerce brands