Google Admits If Searchers Don't Use Your Page In The Search Results They May Be Removed
Briefly

Google disclosed that if users do not interact with your pages in search results, those pages might eventually stop appearing. Martin Splitt from Google explained that low user engagement, strange queries, or the presence of better-performing content can affect a page's visibility. If a page that has been indexed is not showing up in search results, it's crucial to evaluate its performance compared to other content. The insights were shared directly from Google's official YouTube channel, emphasizing the importance of user interaction.
If pages fall off the index again... users don't really use them in search results.
If they are not showing up... we have other pages that we think will help the user more than yours.
Read at Search Engine Roundtable
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