Dennis @ PerfectForms
I would also suggest adding backup notifications to send after a day (or few days).
As Phillip said, you could also create “backdoor” access for yourself. When you access the instance through your dashboard if the user=you, make all fields normal.
These suggestions will help for the future. For this case either re-create the instance, or build backdoor access for yourself, publish the form, map the instance to the new version, and then open it from your dashboard.