I'd be happy to help you redo your reconciliation in QuickBooks Online.
If you are an accountant, you have the ability to undo your reconciliation in the new Reconcile screen by following these steps:
However, if you don't have accountant access, you can manually change the status from R to Blank.
You can check these recommended articles for more details:
I'll be around to help if you need further assistance with reconciliation. Happy Holidays!