It depends very much on what you want out of life.
Find what you want out of life, then find what you need to get it. Then work towards it.
Long story short, there are some tradeoffs involved. If you want a product that can make stupid amounts of money, it needs to be automated and scalable that provides people something they value in a way they cannot otherwise get it in a fashion such that competition is hard or impossible. It's also a good idea to have a clear income stream. It takes a lot of thought, a lot of effort and a lot of time to produce something like this.
So you need to ask yourself, do I really need the billions of dollars? Or would something more modest be "worth it". You are then a lot less limited in the things you can work on, and can think of other options. Small niche things that can't really be turned into the next blockbuster idea, but still make reasonable returns may still be worth your time if it achieves your goals in life.
Tl;dr: Learn what you want from life. Once you understand that, then you will have have solved this.
