Academia or think tank. Both pretty much require a PhD and therefore you will spend just as much time in education.
Become a professor. Lord knows we need more economics professors who actually understand economics.
Adam Mcquaid is one tough hombre.
As long as you don't go full Austrian too often, Academia is absolutely the best route.
Many of the people who speak for Learn Liberty are Professors at many different universities. Learn Liberty is classical liberal. Look around their videos and look at the career paths of the Professors on the biography page of the site. That would be a good start.
Looking at the list of speakers for Learn Liberty, the economics department at George Mason is very free market orientated.
My advice. Have a fall back position or skill. Mine is Physical Therapy Asst, while I go to school for my PhD. It pays pretty well ~24-29$ a hour, and doesn't take that long to learn (2 year degree). That way you can shoot for your goal while not being SOL in the event you fall short. In life, it's generally good to have redundancies and back up plans.
School of Salamanca - School of Austrian Economics - Liberty, Private Property, Free-Markets, Voluntaryist, Agorist. le monde va de lui mÍme
"No man hath power over my rights and liberties, and I over no mans [sic]."
What, sir, is the use of a militia? It is to prevent the establishment of a standing army, the bane of liberty.
An Arrow Against all Tyrants - Richard Overton vis. 1646 (Required reading!)