Founder & SEO Strategist
Short answer: CTR is useful when it changes a decision. A low number alone does not prove that a title needs rewriting.
Start with a comparison, not a ranking report
Select pages with recurring impressions and inspect the actual queries, countries and devices behind them. A page may have a low overall CTR because it appears for broad research queries while still doing well for its intended audience. The aim is to find a coherent query-page pair, not to chase a site-wide average.
Diagnose the promise
Ask three questions before editing: does the query match the page's job; does the visible title name a clear outcome; does the first screen fulfil that outcome? If the answer to the first question is no, a new title is cosmetic. If the second is no, improve the snippet. If the third is no, improve the page.
Test a single hypothesis
Write the reason for each change before publishing it. Then keep the query set and observation window stable. Do not rewrite title, description and article structure together. CTR opportunities in positions 4 to 20 are a practical starting point because the topic is already understood by Google.