The study conducted by Search Engine Roundtable reveals that after attaining the top ranking on Google, if you intend to stop the SEO, your rankings of the site would considerably go down to 30%.
A SEO strategist builds the links to generate online visibility. Thus, when you stop SEO, you cease to create links and thereby Google concludes that the site is no longer live and you evidence low search results. Indeed, a big cost to pay. However, the companies that are consistently working on SEO, even after having top ranking, can observe the growth in their organic traffic to a rise of up to 18%.