I have tried a lot of things, but I'm just not able to create any actions in the journey, based on website visiting behaviour before the contact filled in the submission form (so while the contact was still anonymous because he did not yet fill in the form). 

Can you please help me out on how to create the most simple journey to achieve something like this? So far I'm only able to get data into the journey from the moment sombody already became a contact, but in no way I am able to use data from the time the user was anonymous.