Adding a role using Members and Formidable Forms

Not a coder 🙁 Been using a snippet to change roles when someone completes a Formidable Forms. Works fine. But on another site, I want to just ‘add’ a role. I don’t know how to modify the snippet below to add a given role rather than changing it. Thoughts?

/** * This will change a user to a different member role after they complete their member profile. */ add_action('frm_after_create_entry', 'inactive_to_member', 20, 2); function inactive_to_member($  entry_id, $  form_id){  if($  form_id == 21){ // form id of the form to copy    $  new_role = 'census_club'; //change this to the role users should be granted upon completing form     $  user = wp_get_current_user(); //get logged in user    if(!$  user) {        return; //don't continue if user doesn't exist    }     $  updated_user = (array)$  user;     // Get the highest/primary role for this user      $  user_roles = $  user->roles;    $  user_role = array_shift($  user_roles);    if ( $  user_role == 'administrator' )         return; //make sure we don't downgrade any admins     $  updated_user['role'] = $  new_role;         wp_update_user($  updated_user);  } }```