Deleted a user with administrator rights. Now all the data/content/images are lost. how to recover them back

Using WordPress methods this is not possible. If you created a backup yourself, restore that.

If you haven’t, contact your host. They usually backup a customer’s site and restore it (though this may cost a fee).

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)