Indexed does not mean competitive
Indexing only means the page is eligible to appear in search. Ranking requires relevance, quality, authority, internal support, and a clear match with search intent.
Common causes
The page may target a query that is too broad, have thin content, duplicate another page, miss important subtopics, load slowly, or lack internal links. Sometimes the issue is that stronger pages already satisfy the same intent better.
What to check first
Review the target keyword, SERP intent, title tag, headings, internal links, canonical tag, index status, and competing pages. Then compare whether your page actually answers the query more completely than the current top results.
Practical fix
Improve the page around one clear search intent. Add useful sections, examples, supporting internal links, schema where appropriate, and remove overlap with competing pages on your own site.