Hello OliverSnow,
In a shared server environment there are certain functions and commands that are not allowed. DROP DATABASE is one of those commands. In place of the command, there is a tool in cPanel that allows you to perform that function. Here is a link to our article on how to delete a database in cPanel.
If you have any further questions or information on the issue, please comment below and we will be happy to assist you further.
Thank You,
- Scott M