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(brainstorming) Allow not logged user to complete survey and save data after he registered

Hei guys I arrived to a little block here.

In order to maximize my conversion I would love to bring people that see my ads on Facebook/Ads directly to a survey. Once the survey is finished I d ask them to register in order to book a visit slot with a doctor.
How do you think can I arrive to save information (before user is logged in) and then save it under his name once he registered?