QB Issue Resolution:

You information will stay as read-only for one year, during which time you can reactivate your account.

Resolution for Issue 'If i cancel a subscription can I activate the account again without losing the information?' available: Yes (Solved).
Source: Intuit Community forum.

If i cancel a subscription can I activate the account again without losing the information?: 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.

Support for account again
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Error Recovery for account again [Canada]
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