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Hi, I had the same question. My web LO+EIR had several pages with and without featured snippets. I even tried out asking Google on GSC to review multiple times the page but sometimes it worked and sometimes it didn't...

This is also relevant to knowledge-graph boxes and the images which Google compiles into those. Not quite the same thing as the featured snippets but still pretty neat Typically it's a good one for industrial materials or chemical compounds, e.g: https://www.google.com/search?q=Poly%28methyl+2-methylpropenoate%29 https://d.pr/i/lQLl1v.png (screenshot) or https://www.google.com/search?q=polyethylene https://d.pr/i/HwWXoc.png (screenshot) ... there are lots of 'material' based knowledge graph entries, which pull images from other sites in, in order to build up a good view of what the material is. Some people actually find the images from their sites which Google injects, and edit them to use a small and unobtrusive watermark (the trick is not to get too greedy, or Google notices and replaces the image from your site with an image from another site!) Obviously where branded products and compounds / materials converge, it's easier to get some branding showing in the tiny little images: https://www.google.com/search?q=cbd+oil https://d.pr/i/jLn5uQ.png (screenshot) A lot of these actually come through Google's image search results You don't see so many successful injections in this particular area, these days though This one is quite a neat example: https://d.pr/i/582BzT.png (screenshot) and this one also: https://d.pr/i/kaibeC.png (screenshot) ... bit of free advertising for BirdsEye and Green Giant there

Firstly see what Google thinks of the page. On-page SEO checkers require wider experience to use accurately and efficiently. You can't just take insights from online tools and run with them If the page has no associated keywords / search queries (in Ahrefs, GSC, Google Analytics, SEMRush etc) then that would show Google isn't really that interested. Because keyword data (even from Google) is always heavily sampled, you'd also want to check if, as a 'landing page' (in Google Analytics), the page had been receiving any traffic from Google (Organic Search segment) If the page is doing well despite what online tools say, rules be damned. If the page isn't performing well (or at all) then just re-build it from scratch in line with best practices, and 301 redirect the old URL to the new one. If the URL stays the same then just rebuild on the active URL, that's fine too (but don't publish until the complete re-build is 100% finished and you are 110% happy with it)