Once you have started a project, you might feel this idea is not worth doing and you will have some other ideas. But don't change your mind. Finish what you are

Once you have started a project, you might feel this idea is not worth doing and you will have some other ideas. But don't change your mind. Finish what you are already building. If you leave this project incomplete and switch to another, you will never have a complete project. Instead note down all the ideas you have. Once you are done with current project, go to that list, see what you want to do next.