Your existing Hosting Account cannot be moved from one Hostinger profile to another. Unfortunately, you will be required to make backups of your website's files and databases, Delete the existing account and create a New Account on the second Hostinger profile.
To make your migration smooth, make sure to use the Backups feature that can be accessed in your accounts Control Panel. You can generate a backup of your files and databases automatically there.
Once you've downloaded a backup of your website and databases, you will need to restore them on your new hosting account. These easy-to-follow guides will help you upload your website's files and import the database backup: