 One way to discover your research interests is to look inwards for ideas. You can ask yourself, what are some questions I think in my free time? What topics am I interested in or might be open to exploring? What difference do I want to make in this world? You can also look outwards for ideas. You can browse departmental websites for research done by yourself and faculty. Or you could go to the undergraduate research poster day, which happens every year in May. You can also look over academic articles from journals in your field or from the UCLA undergraduate science journal or UCLA's olive journal for topics in the humanities and social sciences. Feel free to use as many of these methods as you choose or come up with your own. A little reflection goes a long way when narrowing your research interests.