A competitor outranks you and the page looks unremarkable. Rather than guessing at the reason, reduce the page to its vocabulary and look at what it emphasises.
The two-step read
Strip the stop words from their body copy, then run a frequency count on what remains. The top terms are what the page is actually built around — which is frequently not what its headline suggests.
What the gap usually shows
Your page covers the topic broadly. Theirs repeats one specific phrasing throughout, in headings and body alike. That consistency is often the whole difference, and it is invisible when reading normally because repetition is something you notice statistically rather than sentence by sentence.
Use it as a diagnosis, not a template
The finding is which intent they committed to. The response is to commit as clearly to yours — not to match their term counts, which produces text that reads like it was written for a word-frequency check rather than a reader.
Try it: Remove Stop Words on SeoWolf's Notepad.