Google's keyword results seldom decline fast. If this occurs, you should examine this by first evaluating whether there is an issue.
First, determine if this problem happens globally, for individual users, or in a specific place. If your ranking for a certain place or region lowers, it might be due to geo-targeting or personalization considerations.
You might have a bigger issue if test searches repeatedly fail to return your website. Analyze what significant changes you did in the past that might affect keyword ranking it could be changing the internal linking structure, using disavow tool, page layout, or so on.
Want to Discuss your SEO Strategies for Your Business?
Talk to Our Uvisible Experts NOW!
Some Other
Your website may be outranked by competitors for a targeted keyword due to its improved content or SEO strategies, leading to increased competition.
Issues with crawling or indexing such as problems with the robots.txt file, sitemap, site structure, broken links, duplicate content, or slow page load times can cause a website to disappear from search results.
A sudden loss or gain of backlinks, including those from low-quality or spammy websites, a manual action taken by Google, or the loss of high-quality links, can affect a site's ranking in search results.