It would be easier if you named your website so that we can analyze it ... Have you used an SSL certificate? Was the URL of the website correctly entered with https://yourdomain.com and not with http://yourdomain.com in step 5, export to the internet?

If you have changed the entry in the 'URL of the website' field, as described above, this must still be activated in the project. To do this, hold down the Ctrl key and click on Preview, wait until the green progress bar has run through and then upload the project completely, not just the changes.