There are several ways to gather data on your subscribers' preferences and interests:
Signup Forms: Include options for subscribers to select their interests and preferences during the signup process. Surveys: Periodically send out surveys to gather updated information on what your subscribers want. Preference Centers: Offer a dedicated page where subscribers can update their email preferences and interests at any time. Behavioral Data: Analyze the behavior of your subscribers, such as which emails they open and which links they click, to infer their interests.