How can I resubscribe? Apple stopped taking my payments for Quickbooks self-employed so I can no longer access my account/data but also get an error when I resubscribe.

You can search for the specific error directly in the QuickBooks Community or the Apple Support Community. Because Apple manages your billing, their forums often have threads from other users who solved this exact loop.

If you cannot find a quick fix in the communities, please reply with the exact error message so I can check it or contact either of these official support channels to check the issue further.

For QuickBooks Support: 

1. Sign in to QBSE login page.
2. Click Cancel when routed to the Resubscribe page.
3. Select the Help option.
4. Choose Contact Us. 

For Apple Support: Go to support.apple.com. Since your billing goes through the App Store, they can check for payment blocks or stuck subscriptions on your Apple ID.

If you have any additional questions, please don’t hesitate to reach out. We're always here to assist you.