Hello,

Please try to add the code below in the functions.php file in your child theme:

if ( ! function_exists( 'xts_enqueue_waypoints' ) ) {
	function xts_enqueue_waypoints() {
		wp_enqueue_script( 'xts-waypoints-library', XTS_THEME_URL . '/js/waypoints.min.js', array(), XTS_VERSION, true );
	}

	add_action( 'wp_enqueue_scripts', 'xts_enqueue_waypoints', 20 );
}

Clear the cache and check how it works.

Kind Regards