I'd like to share and help you go back to your previous reconciliations.
QuickBooks generates reconciliation reports that can help you review past reconciliation with your accountant.
That being said, if you're trying to make any adjustments or corrections, I suggest that you contact your accountant before making any changes.
Here's how you can pull-up the reconciliation report:
Go to Reports on menu.
Type Reconciliation Report in the Find report by name search bar.
Choose Reconciliation Reports.
Select the Account for the reconciliation report you want to view.
Choose the reconcile period from the Report period drop-down.
Click on View Report.
Also, please take note of the following about reconciliation reports:
It's a static report. If information within your company has changed, that change will not reflect on this report, but will affect all others within QuickBooks Online.
The balance on this report is the balance of all the reconciled transactions, while all other reports show account balance based on posted transactions.
Reconciled transactions are those with the status R listed within the bank or credit card register.
You can check out these articles that you can use as a reference in case you decide to make any changes to your reconciliation: