adding cat to post with views > x

I am trying to add a category to posts with more than X views. I tried adding this

if ( $count > 3){
			if ( has_category('rising', $post->ID) ){
			wp_remove_object_terms( $post->ID, 'rising', 'category' );
		}
			wp_set_post_categories( $post->ID, 'popular', $append );
		} else {
			if( $count > 1){
				wp_set_post_categories( $post->ID, 'rising', $append );
			}
		}

Into the save_postview_data function but does not work

https://wordpress.org/plugins/better-postviews/