Close your Power BI account
If you don't want to use Power BI any longer, you can close your Power BI account. After you close your account, you can't sign in to Power BI. Also, as it states in the data retention policy in the Power BI Terms of Service, Power BI deletes any customer data you uploaded or created. It is not retained.
Individual Power BI users
If you signed up for Power BI as an individual, you can close your account from the Settings screen.
In Power BI, select the gear in the upper right, then select Settings.
On the General tab, select Close Account.
Select a reason for closing the account (1). You can also provide further information (2). Then select Close account.
Confirm that you want to close your account.
You should see a confirmation that Power BI closed your account. You can reopen your account from here if necessary.
Managed tenant users
If your organization signed you up for Power BI, contact your tenant admin. Ask them to unassign the license from your account.
More questions? Try asking the Power BI Community