You can add a custom source to profile creations. This is something that can help categorize and target users in Klaviyo.
From Klaviyo:
Source: the source through which your profile came into your account. By default, all new signups have this property as a hidden field to identify the form that they used to sign up. It is found on all profiles regardless of their consent status and will align with the name of the form used. Source will be captured as a custom property under the Information section of the profile and it’s captured as $source.