Fix WordPress Sitemap Indexing

I’m looking for an experienced WordPress SEO professional to resolve sitemap and indexing issues on my website.

Current issues:
• Despite multiple sitemap submissions, Google Search Console shows “sitemap not available”.
• Several pages are not getting indexed by Google.
• I need all pages to be properly crawled and indexed.

Requirements:
• Experience fixing WordPress sitemap and indexing issues
• Familiar with Google Search Console and SEO plugins (Yoast, Rank Math, or similar)
• Ability to troubleshoot why sitemap is not being read by Google

Deliverables:
• Fully functional sitemap recognized by Google
• All pages indexed and regularly crawled
• Brief report on changes made and verification of indexing

Please provide:
1. How you plan to approach this problem
2. Estimated timeline and cost