In order to analyze your product categories and catch the trends, first, you should be sure you have the correct set-up on Google Analytics.
Article that ı read about how you can control your shopping funnel set-up;
If you have already the correct setup, you are able to analyze each of your category views, and their click rates moreover if you blend it with your Google Ads data you can reach how much money you spend on it.
However, this requires having a systematic approach to continuous monitoring and evaluating performance for catching opportunities.
Some sources that ı curalted about catching opportunities on product categories;
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