200k database (email, mobile.number) students worldwide

Greetings, I would like to consult with you about the following topic (I hope I am at the right address). I have a database of a group of students spread from Canada to New Zealand. I have their information (name and surname, phone number, email, fax, where they study, which country they are from, which country they are studying from, which year, etc.). Now I am interested in what you would suggest and in what way I should sell. Whether it's a service or a product, how to get in touch. Whether you use email marketing or, say, Viber marketing through groups. I am in a dilemma, and I need help. If this whole idea, that is, the mosaic, goes together, it can be very nice to make money because it involves many students. Or we can sell that base; that's also possible I wish you a warm greeting, until the next report!