Problems with topic formulation! Help Needed

Hi! I am doing my PhD in Marketing. My university has briefed us about all the particulars to be included in a research proposal but I am not able to come up with a good topic to research upon. Even if I come up with one, I am not able to understand what could be the possible problem statement I can research upon. I am somewhat interested in market segmentation, and targeting for new brands, but I am unable to formulate the problem or a specific topic. And only after making a topic can I go for the proposal work. So please help me in finding ways to connect the dots. Any suggestions are welcomed.