I found it useful to keep a notebook of ideas that I add to as they come along. No idea is too trivial or too stupid to go into it - they might be the tip of the iceberg of a good idea, especially if a theme keeps recurring. I now have 80+ ideas, ranging from simple programming exercises to fully fledged projects.

Do this, and then pick one and implement it in a few languages.

Yes, and not just obesity. Several vitamins can be toxic, and even fatal, in large enough amounts. See https://en.wikipedia.org/wiki/Hypervitaminosis Health is sometimes about keeping things in balance; e.g. when baking a cake, too much liquid can be as bad as not enough, though in a different way.