Two questions to ask when you are stuck on a project

What is this project about?
This is sometimes a tough question, but figuring it out makes all the difference. If you figured it out at the beginning of the project, simply reminding yourself what the goal of the project is and what the core parts of the project are can be enough to get you back on track. If you haven’t answered that question before and are doing it for the first time, start broad, then keep refining it and narrowing it down. Don’t throw in the towel just because it is tough. When you come out on the other side, your project will be much clearer. Don’t do anything in your project that doesn’t lead directly to the main theme of the project.

What’s missing?
Once you’ve figured out what the project is all about, ask yourself what is missing. What does your still need in order to reach its stated purpose? Write those things down and start working down the list.

This is paraphrased from Steven Pressfield’s Do The Work.