After submit, hide the Contact Form 7 form so only the success message shows then redirect after 3 seconds

hideFormAndRedirect.js

document.addEventListener( 'wpcf7mailsent', function( event ) {
  document.querySelectorAll("form.wpcf7-form > :not(.wpcf7-response-output)").forEach(el => {
    el.style.display = 'none';
  });
  // Redirect on submission
  setTimeout( () => {
    location = '/my-redirect-page/'; // TO DO: Put your URL or slug here.
  }, 3000 ); // Wait for 3 seconds to redirect. Change the delay to what you want.
}, false );