Many Contacts, Different Lists with Different Data Collected - Our Database is a MESS

We have used Constant Contact since 2012. The maybe 100's of forms, contact lists, newsletters to sign up for, landing page sign ups, etc., all had different questions for collecting information. Furthermore, we've edited the form collection information for the same lists. Now when we pull up our contacts for a list and try to extract the information, everything is jumbled (other than their email and name). Is there any way to easily clean this up? We are considering pulling all the contacts and canceling the account, then starting over. Any advice?