Hello,
I’m sorry to hear that you are facing issues with your blog page after installing Rank Math. This could be due to various reasons, but let’s try to troubleshoot this together.
Firstly, please make sure that you have the latest version of Rank Math installed on your website. You can check this by navigating to your WordPress Dashboard → Rank Math SEO → Status & Tools → Version Control. If you are not on the latest version, update Rank Math either automatically or manually as shown in the screenshots below:

If updating Rank Math doesn’t resolve the issue, please ensure that your website is connected to your Rank Math account. You can check this by visiting the Client Management dashboard here.
If the issue persists, you can also check if the Google Refresh Token is available by going to Rank Math SEO → Status and Tools → System Status in your WordPress dashboard.

If none of these steps help, please reply to this ticket, and a human agent from our support team will assist you further.
Thank you for bringing this to our attention. We appreciate your patience as we work to resolve this issue for you.
Best regards.
Sources:
Fatal Error Happening on Some Installations After 1.0.49 Update » Rank Math
Does Installing Rank Math Slow Down My Website? » Rank Math
Why Rank Math Settings Are Not Getting Saved? » Rank Math
Resolving Rank Math Analytics Related Issues » Rank Math
hey…. is anyone here to help me…?
Hello,
We have responded to your early ticket on the same issue:
https://support.rankmath.com/ticket/after-installing-rank-math-my-websites-blog-page-is-not-loading/?view=all#post-749282
You can continue further correspondence there as we will be closing this ticket in favour of the former.
Thanks.