1. Ensure that SearchWP plugin is installed
  2. Upload the plugin files to the /wp-content/plugins/priority-for-searchwp directory, or install the plugin through the WordPress plugins screen directly.
  3. Activate the plugin through the ‘Plugins’ screen in WordPress
  4. Fill “Search keywords CSV” section for the related posts to list these posts first in search results for this keywords.
Plugin interface under classic editor
Plugin interface under Gutenberg