If you want to change your Teams account from personal to business, you need to switch from the free version to the paid version. You could Click on your profile picture and select the Upgrade button.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.