Hello @w3arya,
Thank you for your query and we are so sorry about the trouble this must have caused.
The 0 discovered pages in your sitemap report isn’t an actual error but it appears Google may have discovered your URLs by any other means, please refer to our guide here: https://rankmath.com/kb/zero-discovered-urls-through-sitemap/
Please also note that ranking on Google depends on so much more than just your on-page optimization. You could have the perfect article and still struggle to break the top 10 in SERPs. Here are some of the factors Google considers when ranking you:
1. Your website’s authority
2. Your content’s quality and how better it is than the other article currently ranking.
3. How competitive the keyword is.
4. How many backlinks you have and if they are better than what the other guys ranking for that keyword have.
5. Your website’s crawlability.
6. Frequency of new content and content updates.
7. So much more that there is a dedicated blog post on it by Brian Dean 🙂 https://backlinko.com/google-ranking-factors
Please check for URLs in your Google Search Console and look for any coverage issues that may tell us why your website is not being indexed on the SERP. You may refer to this guide: https://support.google.com/webmasters/answer/7440203?hl=en
Looking forward to helping you.