Travel and surround yourself with new experiences and different kinds of people and build intuitions for things people want by becoming like these people. Share experiences, needs, wants, outlooks.

Then dogfood your own ideas. You will be bringing in others' needs and wants into your idea-generation process unconsciously.

If you are a billionaire you will never ride the bus and never understand the common struggle, and will never be able to dogfood a real solution.

Just an example.