Make sure your site is mobile-optimized. How long someone stays on your site and what they do there (click, for instance) matters. Google reads this as engagement, and the more engagement you have, the higher you rank. Why? Because engagement indicates that they content is answering the query the user input. If your site isn’t mobile-optimized, folks won’t stay on your site long and Google will lower your ranking.
In brief, we are inclined to go along with someone’s suggestion if we think that person is a credible expert (authority), if we regard him or her as a trusted friend (liking), if we feel we owe them one (reciprocity), or if doing so will be consistent with our beliefs or prior commitments (consistency). We are also inclined to make choices that we think are popular (consensus [social proof]), and that will net us a scarce commodity (scarcity).