I'll show you how to activate your account, @belkisyelitza.
Once the subscription is canceled, we hold on to your account for a year before it gets deleted. Let's use the log in to QuickBooks using the same login credentials.
Here's how:
Log in to your QuickBooks Online.
You'll be routed to the Billing & Subscription page.
If not, we can go to the Gear icon and click Account and Settings.
Click the Billing & Subscription tab.
Select Resubscribe, and then enter the updated billing information.
Click Subscribe.
For additional information, please check this link: How to resubscribe or reactivate QuickBooks Online. This also provides details on what will happen to your data by the time you inactivate your account.