I’d like to help and address your concern, @sam-becker.
Let me direct you to our best support available. I suggest contacting our Support team. They have the proper tools to help you retrieve your deleted transactions.
You can refer to this article for the detailed steps on how to reach them: Contact QuickBooks Self-Employed Support.
If you wish to connect your credit card again, feel free to check this link for the complete guidelines: Connect bank and credit card accounts to QuickBooks Self-Employed.
Tag me in your reply if you have other concerns with your accounts or with anything else. I’ll be around to back you up. Stay safe.