You first need to have the ability to see. To see a need in the world.
Often, that can take a lot of years of experience perfecting your craft, noticing the nuances, and being able to assert/understand what it is people want.
Next, you need to have the guts to go for it.
It won’t always work but the ones who dream big and are able to take action are the ones who move the needle towards a more just world.