Name why a page lost clicks before you touch it
Compare the last three months with the three before, by page. Rule out your own recent edit first. Then: fewer impressions at the same position means the search shrank, so leave it; a lower position means someone passed you, so read page one; the same position and impressions with fewer clicks means the results page changed around you, such as an answer box above the links. Only the second cause is a reason to rewrite.
Step 5.1.14
Time: 1h
Done when
For the three pages that lost the most clicks, give impressions, position and click-through rate before and after, whether you edited the page in that window, and which of the four causes fits: the search shrank, someone passed you, the results page changed, or your own edit. (Proof: a list of the items.)