It seems like you're trying to come up with ideas you think are marketable. That's fine of course, but my advice is to worry about that much later. The best source of initial ideas is organic real-world things. You can't force it exactly, except by constantly creating new interesting things. Eventually you're likely to tap into at least one rich vein of human need.

Uber was created because Travis Kalanick wanted to be able to order Lincoln Towncars from his iPhone. He expected it to be used by rich people for airport and nightclub rides. A niche service for the elite. He had no idea they would be recruiting regular people to drive other people around. Now they're on course to change transportation across the world for everyone. They may eventually spare millions of people from drunk driven accidents.