"First-page placement on a search means more hits and visibility for your site along with all the rewards that presence brings. However, your success now raises a new question: Now that you’re there, how do you keep your spot?
Q. My company has finally gotten to the first page of SERPs for my desired keywords. What can I do now to maintain my position?
Use Knowledge Graph to Improve Your Standing
Once you rank for an important search, you should determine what other searches are related to it in the search engine’s Knowledge Graph (MarketMuse does this). By building content around those other searches, the search engines will know you are a more complete source of information on the topic and will improve your rankings across many related searches. —Brennan White, Cortex"