QB Issue Resolution:

Unfortunately, Intuit does not offer an option to downgrade an account. They require that you cancel your current subscription and sign up for a new subscription for Simple Start. This means that you will not be able to import your original data; you will have to start anew, entering beginning balances, etc.

If you want to request this for the future, go to Gear > Send feedback.

Resolution for Issue 'How do I change my subscription to Simple Start?' available: Yes (Solved).
Source: Intuit Community forum.

How do I change my subscription to Simple Start?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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