User

// WP_User_Query arguments
$args = array(
	'role'           => 'organization',
	'number'         => '20',
	'offset'         => '2',
	'meta_query'     => array(
		'relation' => 'OR',
		array(
			'key'     => 'wtba_main_category',
			'compare' => 'LIKE',
			'type'    => 'CHAR',
		),
		array(
			'key'     => 'wtba_sub_category',
			'value'   => 'a',
			'compare' => 'LIKE',
		),
	),
);

// The User Query
$user_query = new WP_User_Query( $args );