Check the email account settings: Depending on your email provider and the email client you're using, there may be an option to restore deleted folders. Check the settings or help documentation for your email service or client to see if this is an option.

Use the "Recover Deleted Items" feature: Some email clients, such as Microsoft Outlook, have a "Recover Deleted Items" feature that allows you to recover deleted emails and folders. Check the help documentation for your specific email client to see if this is an option.