Unfortunately, you cannot simply switch your personal subscription to a professional/business one. You will need to purchase a Microsoft 365 Business plan which involves setting up a new account with a new or existing domain (you will receive a standard Microsoft tenant domain upon signup).
You can find more details about the differences between the two plans here: https://support.microsoft.com/en-us/office/what-s-the-difference-between-microsoft-365-plans-for-home-or-business-31c36a5d-a13d-4b7d-9b1f-2076accbeeab