How to showcase your passion for philosophy?

I want to start a master in philosophy. As an interest. I like having a structured way or learning and also want to have a masters (yes sorry my ego). I don't come from a philosophy background. I did economics. Most universities ask for proof that I have a passion about philosophy. And I do. I read a lot of philosophy of mind and like the contemporary existentialists. But there is a big gap from there to showcase that I am passionate. Any ideas on how to showcase it? Of course I've been thinking about writing a blog or online. To this stack exchange etc. But I can't come up with other ideas. Thank you!