I'm working full time and recently started digital marketing as a side hustle. If you've got any hobbies that you're passionate about you could utilise them! Even if you don't have any particular hobbies, you can buy a digital product (like a digital marketing course that is going to teach you everything you know about digital marketing) and resell it (so less work in terms of creating a product). I'm more than happy to answer any questions you might have in my DMs 😊