Redirect immediately after checkout - used for a global thank you page or redirection.
add_action( 'template_redirect', 'wc_custom_redirect_after_purchase' );
function wc_custom_redirect_after_purchase() {
global $wp;
if ( is_checkout() && ! empty( $wp->query_vars['order-received'] ) ) {
wp_redirect( 'https://wpsandbox.demo.site/my-account/' );
exit;
}
}