Why can’t I add any focus keywords anymore?

Hello,

We apologize for the issue you are facing with adding focus keywords. In the free version of Rank Math, there is a limit on the number of focus keywords you can assign to your posts and pages. If you have reached this limit, you will not be able to add more focus keywords until you remove some existing ones.

Additionally, if you are trying to add focus keywords to categories or product categories, please note that you can only add one focus keyword per category. This is because optimizing such short pieces of content for more than one keyword does not make much sense.

If you need further assistance or have specific questions about your setup, please feel free to reply to this ticket, and a human agent from the Rank Math Support team will assist you further.

Thank you for raising this concern!

Sources:
Why Can’t I Enter More Than 1 Focus Keyword in Post and Product Categories? » Rank Math

Hello,

Thank you for contacting us. We apologize for any inconvenience this issue may have caused.

Please try adding this filter to change the Post Meta Table limit and see if it helps:

/**
 * Filter to change the Post Meta Table Limit
 */
add_filter('rank_math/seo_analysis/postmeta_table_limit', function ( $limit ) {
                return 500000;
        }
);

Here’s how you can add filter/hook to your WordPress site:
https://rankmath.com/kb/wordpress-hooks-actions-filters/

Let us know how it goes. Looking forward to helping you.

Thank you.