You'll note I didn't try to specify what was of import.
We can create mechanisms that enable more people to follow their own idea of what is important instead of merely what is lucrative. Not everyone will agree with the choices other people make, and it wouldn't eliminate money as a motivating factor, it would just slightly reduce the strength of that signal relative to other potential signals such as "I feel like I'm doing something meaningful."
Honestly I think you'd be better off just making _existing_ cheaper than trying to discourage wealth seeking. The cost of living, especially housing, is a huge motivating factor to try and 'get rich first', before doing the 'meaningful work' part.