One quick way to improve a page's click through rate from Google is to make sure the top query for a page, based on impressions, is included within the page title and meta description.
Not only will this hopefully rank the page higher for that already popular query, but Google often makes the search terms bold in the search results - so having them in your page title and meta description can help improve the click through rate in a number of ways.
The "Top Queries Missing From Titles and Meta Descriptions" report checks if the top query for the page is missing from the page title and meta description.
This report gets the top 1,000 pages for a site based on impressions, and for each page it gets the top query from the last 90 days from Search Console based on impressions.
It then displays a simple warning icon if the page title or meta description do not include this query.
You can access this report via the Reports link on the left hand navigation within SEOTesting. Once you request the report, you'll get an email once it has completed running.
Small cavet here, the target keyword the page is going after and the top keyword the page is currently getting most impressions for might not be the same.
When using this report, you need to balance out the opportunity and work of improving the page for the target keyword, versus improving the click through rate of the keyword most visible in the search results.
If you still want the page to target the top keyword, rather than the one getting the most impressions, may be this keyword that is getting all the impressions would make a good new sub page which is linked to from the main one?