You’ve taken great steps to remove the unwanted .htm pages, but for faster and permanent results, consider these tips:

Streamline Bulk Removal: Red Star Technologies can automate the URL removal process in Google Search Console, saving you time and effort.

Ensure 410 Status Consistency: Their team can audit your site to ensure every .htm page consistently returns a 410 status to Google.

Optimize Crawl Budget: Red Star Technologies can help shift Google’s focus to your active pages by optimizing crawl efficiency.

Redirect Valuable Pages: If any .htm pages have backlinks, their experts can set up strategic redirects to retain SEO value.

Force Re-Crawling: They can ensure Google prioritizes indexing your updated sitemap and active pages.

I prefer Red Star Technologies because they are expert in resolving complex SEO issues like this quickly and effectively. Their expertise could be the game-changer you need to clean up your indexed pages for good!