Hello, we apologize for the issue you are facing with your sitemap not updating. There are several reasons why your sitemap might only be showing the "hello-world" post. Here are some common causes and their solutions:
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Noindex Setting: Ensure that the posts you want to include in the sitemap are not set to Noindex. You can check this by going to the Advanced tab settings of each post and ensuring the Robots Meta tag is set to Index.

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Custom Canonical URL: If you have set a custom canonical URL for your posts, they may not appear in the sitemap. Check the Advanced Tab in Rank Math settings for each post and ensure that the canonical URL is set correctly.

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Sitemap Settings: Go to Rank Math SEO → Sitemap Settings and ensure that you have not excluded any post types or specific posts from appearing in the sitemap.
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Empty Archive Pages: If your category or tag archive pages are empty, they will be excluded by default. You can enable the option to include empty terms in your sitemap settings.

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Caching Issues: Sometimes, caching can prevent the sitemap from updating. Make sure to clear any cache on your site and check if that resolves the issue.
If you continue to experience issues after checking these settings, please reply to this ticket with your site URL so that a human agent from our support team can assist you further. Thank you for raising this concern!
Sources:
Why Isn’t My URL Included in the Sitemap? » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.