The data can be retrieved from the devices used in the field if the Sent boxes have not been emptied. I am not sure how many devices and surveys have been uploaded and if this is possible for you. There is a section on recovering data from a mobile device here: Troubleshoot—Survey123 for ArcGIS | ArcGIS .
Thanks, I was able to recover the data. I had to get it off of my phone and it was in SQLite, so relatively hard to understand but I figured out how to read it and just resubmitted with the old data.