Add extra user info to the user settings page in a wp.org site.

custom_user_contact_methods.php

<?php
  function my_new_contactmethods( $contactmethods ) {
      //add Birthday
      $contactmethods['birthday'] = 'Birthday';
      //add Address
      $contactmethods['address'] = 'Address';
      //add City
      $contactmethods['city'] = 'City';
      //add State
      $contactmethods['state'] = 'State';
      //add Postcode
      $contactmethods['postcode'] = 'Postcode';
      //add Phone
      $contactmethods['phone'] = 'Phone';
      //add Mobilphone
      $contactmethods['mphone'] = 'Mobilphone';
  
      return $contactmethods;
  }
  add_filter('user_contactmethods','my_new_contactmethods',10,1);

https://codex.wordpress.org/Plugin_API/Filter_Reference/user_contactmethods
https://generatewp.com/user-contact-methods/