Filter by one custom field, order by another?

You could use the query to filter the content as you intended by using the ‘meta_query’ with filtering options, and for the order part, just add/modify the following parameters:

• ‘orderby’ => ‘meta_value’
• ‘meta_key’ => ‘location_level1_value’

• ‘order’ => ‘ASC’

  $wp_query = new WP_Query( array (
      'post_type'      => 'listing',
      'posts_per_page' => '9',
      'post_status'    => 'publish',
      'meta_query'     => array(
          array(
              'key'       => 'gateway_value',
              'value'     => 'Yes',
              'compare'   => '!='
          )
      ),
      'orderby'  => 'meta_value',            // this means we will be using a selected 
                                             // meta field to order
  
      'meta_key' => 'location_level1_value', // this states which meta field 
                                             // will be used in the ordering, 
                                             // regardless of the filters
      'order'    => 'ASC',
      'paged'    => $paged
      )
  );