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Following this..

There is no inbuilt functionality for this however you can use this jugad, 1: Create a drop down select property names "Free Trial" with Yes and No option. 2: Add this field as a hidden field on the form 3: Mark all first time form fills as Yes in free trial via a workflow. 4: Add a custom code on the LP

onFormSubmit: function($form) {
  var free_trial = $form.find('select[name="free_trial"]').val();
  setTimeout( function() {
   if ( free_trial == "Yes" ) {
    window.location.href = "<https://website.com/already-used-free-trial>";
   }
else{
window.location.href = "<https://website.com/trial-started>";
}
  }, 500 ); // Waits 1/2 second to redirect.
 }
});

You can customise the copy on these 2 URLs based on what you need.

Thanks Manish.. Will try and see

You might need to have a CDP and identify users from their IP, Country and ID used and stitch the details.

You will need an API which can intercept the form submission and search using Contact API and respond appropriately and then redirect if email is found

You might have tried this but stating here. Hubspot has an in-built logic where if the field has already been filled before, you can state there itself that this email ID has already availed the free trial, instead of taking them to a new landing page.