i don't think going back to the school is a good idea, the pay isn't as much as when you're in the industry.
if you want to contribute to the humanity - start a FOSS project and ask people to join you.
currently I am doing my PhD ... and my salary isn't as much as my friends who're working outside there (my wife's salary is also higher than me!).
so if you have no plan to go to grad school, join/start any FOSS project.
but if you're willing to pursue your study so that you'll become an academician one that - try to contact any professor according to their research interest or look around at any job vacancy in the department's webpage.