It could help to switch gears entirely for a while; study a trade that involves physical craftsmanship (vs. mental) and/or gets you outside or using your body. Do it with focus, for long enough to gain real skill. You may come back to coding, or you may not.

Another thought -- there's a special kind of burnout when you realize that the "problems" most new products/services solve not really problems -- they are just about moving money around more easily or in different ways, or convincing people more effectively to buy more things they don't need.

How do you define a good idea? "One that makes money" is pretty weak. Some people can motivate themselves purely on the money something will make; the rest of us need to dig a bit deeper when looking for worthwhile projects. One that solves a particular problem you have, for other people, is also pretty weak if your personal problems are all trivialities. "I travel a lot, and it's hard to find shoes that are still comfortable at the end of a long flight."