Sitemap Generator Forum

My sitemap contains 20156 links. But only 4.9k links are valid and indexed rest links are excluded. How should I fix this

Hello,

can you post a screenshot with example URLs?

Thanks for your reply . Here is the screenshot of excluded URLs and sitemap coverage status. This the php sitemap hosted on my server.

Discovered - currently not indexed {13.6k URLs}:-

[ External links are visible to forum administrators only ]
[ External links are visible to forum administrators only ]
[ External links are visible to forum administrators only ]
[ External links are visible to forum administrators only ]

Crawled - currently not indexed {1886k URLs}

[ External links are visible to forum administrators only ]
[ External links are visible to forum administrators only ]
[ External links are visible to forum administrators only ]

Valid {5.03k URLs}

[ External links are visible to forum administrators only ]
[ External links are visible to forum administrators only ]

Hello,
sitemaps are used to inform search engines about the pages (that's the number of "Submitted" pages). Indexing though (and showing indexed pages stats) takes time and depends on many other factors, not related to sitemap.