1. Log in to your control panel at https://panel.wepwawet.net/
2. Select and stop your server.
3. Under Server Management select the File Manager tab, then select all three worlds (world, world_nether, and world_the_end)
4. Click on the Delete button on the new prompt that is shown at the bottom of your screen.
5. After deleting, start the server.
Your new world will now be generated!