You can delete your server by clicking the Manage button on the server page.
Click on the Settings button.
Scroll down to the Danger Zone. Here, you will click the Delete Server button.
A pop-up message will appear, which explains that you will have 3 days to cancel the server deletion, or all data will be deleted permanently.
Clicking the Delete Server button here will start the deletion process. You will then be directed to the temporary server dashboard with options to restore the server or download the data.
If you click on the Restore Server button, your server will be removed from the deletion process and full access restored. Otherwise, your server will be fully deleted after the 3-day period has expired.