“Yes, Google is constantly changing. And yes the changes affect your traffic. But no, the biggest SEO trends don’t affect your rankings. They affect your click through rates. There’s a big difference.
Changes to the ranking algorithm are real, but the much bigger SEO trends are the “SERP features,” such as featured snippets, maps and videos. There’s just a lot more stuff showing up in search results these days.
Over time, more and more searches are “no-click” meaning the searcher’s information needs are satisfied by the SERP features. That means less traffic is flowing from Google to websites.
So this is the mega-trend in SEO: more features on search results pages and therefore a lower click-through-rate to websites.”
Crestodina, Andy. March 2019. The Biggest Trend in SEO