Perform your own experiments

When you find out that, despite the interesting observations of some researchers, a compelling connection doesnt exist yet between drosophilia and ongoing attempts to mutate cancer cells, you may well have found an avenue for your experiments. If the critical literature is significantly silent on the topic of Wonder Woman, youve got something to write about.
As you complete your coursework and add complexity to the topic in which youre interested, youll likely change and add depth to your initial research interest. Thats ok. Let the research grow you understanding of the topic, and change the way you approach it. That means youre on the right track.