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Unfortunately, because you didn't plan ahead for this , it's going to be very difficult to tie things back together.
The way to set up for this situation is to use a proxy field on the form instead of the Email Address. This will allow people to change their email addresses instead of upserting a new lead (you manage the change of address in a Flow step).
Now, you'll have mkt_tok-enized Visit Web Page activities and Filled Out Form activities on the same URL, so in theory you could merge the disparate leads. But you'd need to pull in a developer to make the connections via the API.
Thanks for the info. This is a small test with only a few form fills so no damage done.
Can you link any product docs that speak to adding a proxy?
I found some on progressive profiling but it's not what you're describing. Configure Form Progressive Profiling - Marketo Docs - Product Docs
It's simple enough to not require a doc.
Create a custom field of Email type like 'User-supplied Email'. Add that to the form, not the system Email Address field. Then use a Data Value Changes trigger + Change Data Value step to push that value into the system field.
Using proxy fields is a good idea in general to stop leads from overwriting your more current data.