The most important active step you can take to cultivate your curiosity is probably to seek out the topics that engage it. Few adults are equally curious about everything, and it doesn't seem as if you can choose which topics interest you. So it's up to you to
Hypothesis 1: The "golden age" hypothesisThe "golden age" hypothesis says there are one or more "golden ages" from the past that were superior at producing innovation compared to today. Perhaps understanding and restoring what worked about those "golden ages" would lead to an explosion in creativity today.