By going to product hunt and making exact copy of something. By lurking on HN and making a copy of one of "Show HN". Just pick something that seems interestin

By going to product hunt and making exact copy of something. By lurking on HN and making a copy of one of "Show HN". Just pick something that seems interesting for you. Spend 2-3 years building it and marketing and if it works well you have it. If it does not work, start over again. Unless you want a sure money making product - then stick to your 9-5 job that is money making product you have for sure. Which is also like "find people that want something and build it for them" because that will be your next 9-5 job then.