What you wrote reminds me of something a professor of mine said in college. Good research is a circle. You start at the top of the circle with a question. If it’s a question worth asking, you gather information, synthesize it, and come back to the top of the circle with even more questions!!!! And the cycle continues. But if all of your questions were completely answered, it probably wasn’t a very interesting question. So, I know it’s frustrating to revise, but… maybe you can think of it as a sign that you’re working with a good question ;)