You're not just picking a topic, you're joining a community of scholars in a conversation about something you're all interested in. This requires you get to know something about the conversation before you join in so you don't re-do someone else's research.
So picking a topic is more than just making up a research question. You need to:
*The more you research, the more your research question will change and refine, until your topic is clear and the terminology reflects what is current in the discipline. Below left - helpful videos. Below right - an image of a sample research process.
See what professional researchers are up to...and choose something you're interested in reading about!