How to check a site for low value content
Type a site link into the checker, add your Search Console and analytics numbers if you know them, and read the percent as an estimate, not a verdict from Google.
Start with the site link. Add a target keyword only if the site has one main topic. If each page targets its own topic, a single site-wide keyword will mislead the result, because the checker only looks for it on the first page.
Add the domain registration date and the site launch date if you know them. A site under a few months old scores worse in the model, which matches how new sites are often treated, but age alone does not fix thin pages.
Read the "Why this estimate" list first, not just the percent. Fix the content reasons before the traffic reasons. Add steps, an example, or questions and answers to pages that explain nothing. Give every page its own title, meta description, and one main heading. Link the privacy, contact, about, and terms pages if any are missing.
Check the manual action option in Search Console under Security and manual actions before you trust any percent. If one is listed, fix what it names first. The checker cannot see copied text, AI authorship, or a ban, so a clean percent is not a promise of approval.