Reviewing whether your existing pages actually cover their topic thoroughly is something you can assess yourself by comparing against what's currently ranking well.
Compare Against What's Currently Ranking
Look at the pages currently performing well for your target terms and note what they cover that yours might not.
Identify Thin Pages Honestly
A page that's noticeably shorter and less thorough than its competition is a candidate for expansion or consolidation.
Prioritize Coverage Over Word Count Alone
The goal is genuine topic coverage, not hitting an arbitrary length target for its own sake.
Next step: Use the SEO Audit to flag thin or underperforming pages worth a content depth review.