Google Confirmed Last Week Algorithm Update As "Broad Core Update"
https://www.seroundtable.com/google-...ate-25612.html

What Do You Do If Your Rankings Dropped?
The answer, according to Google, is really nothing. Google went on to explain that "as with any update, some sites may note drops or gains." Google says your site may be fine, "there's nothing wrong with pages that may now perform less well," they said. "Instead, it's that changes to our systems are benefiting pages that were previously under-rewarded," Google added.