Hi @satoriglass, unfortunately @cyberdave is right. :-/ Once the data has been lost, it is permanent. Our forms feature can definitely use improvement on how we handle the data as well as how you interact and use form submissions from your website/customers. Really sorry about the trouble.
Your request about replying to senders from form submissions has been brought up before too. If you have some time, please share your thoughts on this thread: Reply directly to sender from form submission emails - Product feedback - Forum | Webflow Hopefully we can implement something like this soon!