One way to become more depressed is by learning. Learn in-depth about the many issues our world has, and soon you'll feel powerless and hopeless, and that this world isn't worth it when so many people choose to ignore the problems that can only be resolved by combined effort. People who worry about climate change, animal abuse, human trafficking, environment, human rights, ongoing wars, and other more specific horrors in certain industries, tend to be more depressed. And if you add personal traumas to this then the final result will be pretty impressive.