One simple way to find new problems is to follow the advice once given by Deep Throat: "Follow the money!"

What I mean is look into your own spending patterns (or those of your friends/ parents/ neighbours/ colleagues) and ask yourself why does something cost as much as it does? Can it be made more cheaper? Or if it is already cheap, can the difference consumer saves be used for some meaningful, complementary services/items?

Thinking this way can reveal many interesting and unexpected answers and the best thing is that this quest takes you out of your room, since you have to follow the money trail and understand how different businesses work. Doing that as an outsider is likely to spark many interesting thoughts.