Reputation Point based on Total Posts

try this

add_action ('bbp_theme_after_reply_author_details', 'display_user_percentage') ;

function display_user_percentage ($reply_id = 0) {
		$user_id=bbp_get_reply_author_id( $reply_id ) ;
		$topic_count  = bbp_get_user_topic_count_raw( $user_id);
		$reply_count = bbp_get_user_reply_count_raw( $user_id);
		$post_count   = (int) $topic_count + $reply_count;	
		$stats = bbp_get_statistics();
		$total_posts = $stats['topic_count'] + $stats['reply_count'] ;
		$percentage = $post_count/$total_posts*100 ;

		echo '<div class="tc_display">' ;
		echo '<ul>' ;
		echo '<li>' ;
				echo 'User Contribution : ' ;
				echo round($percentage, 2) ;	
				echo '%' ;
		echo "</li>" ;
		echo "</ul>" ;
		echo "</div>" ;
	}

Put this in your child theme’s function file –

ie wp-content/themes/%your-theme-name%/functions.php

where %your-theme-name% is the name of your theme

or use
https://en-gb.ww.wp.xz.cn/plugins/code-snippets/