You've earned c. 400 EUR more than me by the looks of it! There's a few options you have:

1. Partner up with a business-minded person. I've tried this before, didn't work. You still need luck finding a person who's able to identify the right opportunities.

2. Acquire sufficient experience through your day job. But you still need to be in an industry where it's possible to start something of your own.

3. Find an area you're genuinely interested and dive into it - including networking with other people.