Someone Comment 1000 times in a Day in My WordPress Site, What Can i Do

You can add Google recaptcha to your comment forms. You have two ways:

1) with plugins: https://beautifulthemes.com/blog/recaptcha-in-wordpress-comments/
2) without plugin: https://www.oueta.com/wordpress/add-google-recaptcha-to-wordpress-comments-without-plugin/

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