Most probably, you uploaded the files to wrong folder. When you log into your domain via FTP, you should see three folders. Maildir, Logs, and yourdomain.com. You should upload your files inside yourdomain.com folder.
If you have uploaded the files to the right folder but still can't visit your website, it could be because your domain is too new to the public. I guess you just registered your domain. It will take some time for new domain to propagate (to be available) in the Internet.
So please check whether you have put the files in the right folder and give Internet some time to publish your domain.
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