"building beautiful, meaningful things. Things that people want."

Just because people want what you've built does not necessarily make it meaningful. Meaning is a very subjective, personal thing, based on your core values. What person x finds meaningful and is willing to pay for, person y may think is meaningless. So ask yourself whether you want to build something meaningful to you, based on your core values or do you just want to build the next hot game/app/whatever, and get rich. There's nothing wrong with the latter, but be honest with yourself.