How do I unsign a PDF document???

I filled out a fillable form in Acrobat Reader DC but did not fully complete it. I then signed it and now, in Adobe Acrobat DC, I cannot fill in the form fields that were once fillable!!! I assume this is because it has been signed. Is there anyway to 'unsign' it and get the fillable form fields to show up again? It is a long document and otherwise I will have to open the original form and fill it out all over again!!! Is there any way around this??? I just need the fillable form fields to show up again so I can finish filling the document and then sign it from there.