Contact Form 7 Submission Redirect

functions.php

<?php
add_action( 'wp_footer', 'mycustom_wp_footer' );
  
function mycustom_wp_footer() {
  $site_url = get_site_url();

	?>
	<script>
		document.addEventListener( 'wpcf7mailsent', function( event ) {
			location = '<?php echo $site_url; ?>/landing-thank-you/';
		}, false );
	</script>
	<?php
}