As we can see, you have already imported the dummy content. Could you please clarify which version do you want and what builder you are going to use (WPBakery or Elementor)?
We will reset your website and import it from scratch. Note that all your current content will be erased.
There is some problem with your hosting server and it can’t handle the dummy content import request. Maybe there is a PHP time limit problem since it breaks the request after 60 seconds. Contact your hosting provider for help on this matter https://prnt.sc/-mRTnAqg1E6F