Hello there, mf. I'm here to answer your company query in QuickBooks Online (QBO).
You can access your old company using the same credential since once the account is canceled or closed, you'll have read-only access within 365 days. After that, your data will be deleted by the system. That said, it's best to export your data before canceling to have a copy of the data you need for the future.
Here's how:
Go to the Gear icon and select Export data.
On the Reports tab, choose the date range. Then, toggle the reports you want to export.
On the Lists tab, toggle the lists you want to export.
Also, please note that one company is for one subscription only. After exporting the data and canceling your subscription, you can open a new company by subscribing to a new plan. You can use the same credentials for your old company so you can