Pages with few incoming internal links do not pass as much strength to important pages, meaning it will be more difficult for search engine bots to discover and crawl them efficiently. They can also lead to bad usability, as it might be difficult for users to find those pages.

Add more internal links from other relevant pages to these pages. You could do a site search (type site:www.example.com keyword) into the google search results to find thematically relevant pages.

Use Google Analytics data to see which pages receive the highest amount of sessions. These pages are important for your visitors, so you should incorporate these into internal linking structures and navigation elements. Learn more in this article.