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Can you post a log file? if you don’t want the domain shown search & replace it with example.com ? or show us a photo of the problem? or use screaming Frog to run a Java test?

Sitemaps cannot (should not) contain more than 50,000 URLs: https://www.sitemaps.org/faq.html#faq_sitemap_size I'd recommend you instead create a sitemap index to house multiple sitemap files. Keep in mind you will need to separate the URLs in them in order to represent all 60K URLs you have in your existing sitemap. Separately, EGOL makes excellent points: sitemaps aren't the only way to get pages indexed. It's entirely possible that you do not have sufficient internal links that aid crawlers' discovery of your content: https://moz.com/learn/seo/internal-link You may also have directives (e.g. noindex) on certain pages or in your robots.txt that prevents crawlers from crawling and indexing certain parts of your site. It may be time for a technical audit: https://www.distilled.net/technical-seo-audit-checklist/

Do you know how long it takes Google to drop pages from Google's index/cache?