We're unable to continue the remaining days of a trial account once cancelled. Although, you can create another one to start all over again. Here's how:
Select the type of subscription that you need, then make sure to select Free 30-day Trial.
If you wan to use the same login credentials, click Add another company. If not, enter the required details and click Start Free Trial.
Follow the onscreen instructions on how to create an account.
Once done, you can move your list from the old account to the new one. Here's an article as a guide on how to do that: Move Your Lists To QuickBooks Online.
Since you're new to QuickBooks, I'd also like to share this article to help your self familiarized the program: Get Started With QuickBooks Online.
Don't hesitate to reach out to us again if you need anything else.
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