Think through what you like doing. Don't worry at this stage whether you can see any money-making potential in it; the only criteria is whether you've reached a reasonable standard of competence at it. For example, if you enjoy writing (like I do!), are you able to write a coherent piece of fiction or non-fiction and have you received positive feedback on your writing? If you love to knit, can you make simple garments which look good and which fit?

It's important to consider whether you're good at your chosen activities because in order to make money from something, you usually need to have reached an acceptable standard at it. You don't need to be an expert, but you shouldn't be an absolute beginner.