If you have an npm user account, you can convert your user account to an organization. When you convert your user account to an organization, we will:
Note: Once your old user account has been converted to an organization, you will no longer be able to sign in to npm with your old user account.
Below the account creation form, click Convert.
Review the account conversion steps and click Continue.
On the new user account creation page, in the "Username" field, type the name of your new user account, then click Submit.
On the plan selection page, select either the "Unlimited private packages" paid plan or the "Unlimited public packages" free plan, then click Buy or Create.
If you selected to use the unlimited private packages plan, in the payment dialog, provide the email, name, address, and credit card information for the card that will be used to pay for the organization.
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https://docs.npmjs.com/converting-your-user-account-to-an-organization