Thus, keep in mind that a good research should be coherent and in unity. Each previous element determines the way and quality of the next element. Otherwise, your research paper would be loosely organized and hard to follow.
Is there an end to the research when it comes to the conclusion part? The answer is no. With the limitation of your current research, naturally, you will start to think about in which ways you can improve the research, or what new research questions you can ask and find answers to them to minimize the limitation of the existing research. Aha, so this is why I think a good research should be circular!