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Please note that ranking on Google depends on so much more than just your on-page optimization. Here are some reasons why your site might be experiencing a decline in ranking on Google.
1. Seasonal Fluctuations: Certain industries or topics experience natural fluctuations in search volume throughout the year. If your website or content is related to a specific seasonal trend or event, the decline in ranking and impressions may be due to a decrease in search interest during this period.
2. Algorithm Updates: Google frequently updates its search algorithms, which can impact the visibility of websites in search results. If there have been recent algorithm changes, it’s possible that your website’s ranking has been affected, leading to a decline in impressions.
https://rankmath.com/blog/google-algorithm-update-recovery/
3. Technical Issues: It’s important to ensure that your website is properly indexed by search engines and that no technical issues are preventing Google from crawling and indexing your pages. Check for any errors or warnings in the Google Search Console that could be affecting your site’s visibility.
4. Competitor Activity: Increased competition from other websites or changes in their SEO strategies can impact your ranking and impressions. If competitors are optimizing their content better or generating more relevant backlinks, it could lead to a decline in your own ranking and impressions.
To identify the specific reason for the decline in ranking and impressions, it’s essential to analyze your website’s performance, conduct a thorough review of your SEO strategy, and monitor changes in search trends and competitors.
You can use this guide to run an SEO audit on your site: https://rankmath.com/blog/seo-audit/
Regarding the attachment URLs, you can use the URL inspection tool of your GSC account to check the URL and view the referring page to make sure from where it is coming.
Once you know the referring page, you can unlink or remove it so Google won’t discover it again.
Let us know how it goes. Looking forward to helping you.
Thank you.