Thanks for reaching out to the Community for support. It can be a little frustrating accidentally deleting your invoice, but don't sweat. We will have up and running in a few easy steps.
At this time, the only way to recover the deleted invoice would be to re-enter it. Although having the ability to recover it without having to re-enter it would be a great idea, it's currently not available in QuickBooks Self-Employed. If you'd like, I can submit this product feedback to our development team, so this can be considered in a future update. Until then, follow the steps below to re-enter the deleted invoice.
Go to the Invoices menu at the left pane.
Select Create Invoices, then type the client's name, address, and email address.
Enter the other necessary information.
Once done, select Send invoice to email your invoice. You can also click on the arrow and Preview to see what your customer will receive.
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Please let me know if you have further questions or concerns. I'll be here every step of the way. Feel free to reach out to the Community at any time. We've got your back. Take care and have a wonderful week!