Testing, reviewing, and revising your taxonomy is essential to ensure it matches the existing mental models of your users. Here are some ways to do so:

• Card sorting: Ask users to group terms in ways that make sense to them. This helps understand how users think about categories and labels, ensuring the taxonomy aligns with their mental models.
• Tree testing: Present users with a simplified version of your site's hierarchy (the "tree") and give them tasks to find specific items. Track their success rate and the paths they take to see if the structure matches their expectations.
• Usability testing: Have users perform real tasks on your site. Observe how they navigate and identify any difficulties they encounter, ensuring the taxonomy supports intuitive navigation.

Based on the feedback and data, make adjustments. Simplify categories, add missing terms, or reorganize the hierarchy. After revisions, test with users again to ensure that the improvements work.