Make both your post content and sidebar category and/or visitor location relevant.
Plugin Tag: category widget
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Advanced Categories Widget
A highly customizable categories widget for WordPress with thumbnails and descriptions.
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WP Categories Widget
Display the list of categories for any taxonomies type (WooCommerce Product Category, Blog Category, Project Category…etc) in sidebar
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Iks Menu – WordPress Category Accordion Menu & FAQs
Super customizable WordPress plugin for displaying custom menus, taxonomy/category terms and FAQs as accordion menu (with images support).