If you're referring to the transactions on your Banking page inside QuickBooks Online (QBO), know that your transactions will disappear if they're on the For Review page and the subscription expires. In this case, you'll want to renew the account and then update your bank to get the transactions needed.
If you categorize them before the account expires, they'll stay in the account register until you renew your chosen subscription. To renew the account, here's how:
The Community team is always ready to help if you have other questions about managing bank transactions and subscriptions inside QuickBooks. Have a good one.