[mvpu]

Well, there's a couple of ways. First, and easiest: copy someone's proven idea. Something you can do, you'd love to to, is proven to make money, and the margins work for you. Bonus: if you can do it better, cheaper, faster. This is the safest route.

Second, pick a problem you, your close family members, or your close friends have. A problem that's painful enough that they'd pay for, interesting (for you) enough that you can spend a few years solving, and practical enough that you can do it with the means you have today (i.e no investment). If it's a "new" idea, it's a lot of risk.

For most people, a small, niche, proven idea that makes money is good enough. It'll take a few years to try a bunch of experiments and see money, though. Grind it out...