Is there a specific reason you aren’t using WP_User_Query? It would make it easier to do what you want to. You can read up on it here.
Something along these lines would solve your problem, as far as I understand it:
$args = array(
"meta_key" => "ArtistCategory",
"meta_value" => "X" //or "Z"
);
$authors = new WP_User_Query($args);
if (!empty($authors)) {
echo '<ul>';
foreach ($authors as $author){
//However you want to echo each author.
}
echo '</ul>';
}
else {
echo 'No authors found';
}
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