Make a list of the five or ten most interesting papers you have already read. Do two or more of them share a topic? Like, they're all about "online shopping," but two of your ten are about how to optimize discounts to get profits. Okay, that gives you a narrower topic, optimizing discounts. Then start reading about that subtopic. After you've read another twenty or thirty articles—this count includes articles where you stop after 2 pages because you weren't interested, because not being interested in something is as helpful for narrowing down your interests as being interested in another thing—do another two or three have something even more specific in common? Like, now these are all about discounts, but three or four are about using discounted trial memberships to get people to stay members of a subscription service. Reiterate ~3 times until you have a less massive topic. When you have that, you can go talk to your professor about how to ask a problem-solving question about that topic.