You can’t leave your own server before transferring ownership to another member. If you don’t want to transfer ownership or be the owner of your server, the only way to leave it for good is to delete the server. Remember: Only the server owner has the ability to delete it, regardless of the permissions assigned to any member.
You’ll have to open your Discord app on your desktop and click the Server Name bar. When the options menu opens, click the Server Settings tab.
You’ll then have the option to Delete Server.
Once you delete your account, Discord will typically place it on hold for 15 to 30 days so that you can be recover it in case you’ve inadvertently deleted it.
Once that period expires, Discord begins the process of removing identifying information and anonymizing or adding other information. Most of this happens quickly, but it may take up to 45 days to remove identifying information from backup copies.
Discord retains aggregated and anonymized information. The platform can no longer identify you with this information. As it’s no longer linked to you as an individual.