Hello,
We apologize for the issue you are facing with your posts disappearing from the search engine results pages (SERP). There are several potential reasons why this might be happening:
1. You Have Blocked Google From Crawling Your Site
If you have accidentally blocked Google from crawling your site, it could prevent your posts from appearing in search results. Check your robots.txt file to ensure that there are no directives blocking Googlebot from accessing your content. You can use the robots.txt testing tool to verify this.
2. Google Has Not Indexed Your Site Yet
If your website is relatively new or if you’ve made significant changes, it may take some time for Google to re-index your site. You can use our Instant Indexing plugin for Google to help submit your URLs to Google and expedite the indexing process.
3. Security Issues
Sometimes, security issues can lead to a drop in rankings or visibility. Ensure that your site is secure and free from malware or other security threats.
4. Your Site Has Been Penalized by Google
If your site has violated any of Google’s guidelines, it may have been penalized, which could result in a drop in rankings or removal from search results. Check Google Search Console for any notifications regarding penalties.
5. Monitor Your Site’s Indexation Status
Utilize the Google Search Console to monitor your website’s indexation status and check for any errors that Google has encountered while trying to crawl and index your site. Additionally, you can use the Index Status report in Rank Math’s Analytics to identify any issues with your pages.

Conclusion
These are some common reasons why your posts may not be appearing on SERP. We recommend checking these areas and making necessary adjustments. If you continue to experience issues, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further.
Thank you for raising this concern!
Sources:
Why Did My Website Disappear From Google Search? » Rank Math
still facing the issue after doing all these nothing
Hello,
Please note that Google released one core update and one spam update to its search ranking algorithm in December: https://rankmath.com/google-updates/
So, it is possible that your website was affected by the algorithm update.
In this case, please refer to the following guidelines for how to confirm that and fix it: https://rankmath.com/blog/google-algorithm-update-recovery/
Let us know how it goes. Looking forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.