Only a few pages indexed by google despite sitemap listing all pages

Hi everyone, I have a website: gatewayabroadeducations.com with approximately 280 total pages, including many blog posts. All of these pages are included in the sitemap, which I've submitted through Google Search Console. However, when I check using site:gatewayabroadeducations.com in Google, I can only see around 29 pages indexed. The rest—including most of the blog posts—aren't showing up in the search results. Here's what I've already checked: All pages are listed in the sitemap No pages are blocked by robots.txt Pages return a 200 OK status Canonical tags appear correct No manual actions or penalties in Search Console I'm not sure what's causing this issue. Could it be related to: Content quality or duplication? Poor internal linking? Crawl budget limitations? Something else? I'd appreciate any insights or suggestions to help identify and resolve the indexing issue. Thanks!