I'll point the way and ensure we'll reactivate your account. Please note that following the cancellation date, we keep your company data for 356 days. Your data will still be accessible once you decide to subscribe again during that period.
You'll be asked to resubscribe or reactivate your account after logging into your QuickBooks Online (QBO) account. Here's how:
Click the Gear icon located at the top right corner.
Under Your Company, choose Account and Settings.
Click Billing & Subscription, then Resubscribe, and enter the updated billing information.