Ideas to narrow down a master thesis topic within management scope
I would suggest that you find a paper published within a good journal in your field and use it as a template. The paper should be (i) on a topic of interest to you, (ii) easy to understand (relative to the norm), and, (iii) using methods that you and your supervisor are familiar with, or can easily learn and use in your own research. To use this paper as a template, simply ensure that you are guided by the structures and logic of the paper in how you present your own. For example, if the paper is about how X causes Y explained through theory Z, you can simply reused some of the argument, while changing one of the variables.