Well it doesn’t have to be that hard, you just have to come up with a problem that is not actually a problem for you, making it very trivial. An example: right now it is sunny outside, so what if I could build a service that notifies me of the time for sunset every day.

It doesn’t have to be a problem with actual value to anyone, but once you start thinking about it, you will probably find it engaging to solve.

Feel free to make a more helpful suggestion!