Need Guidance for Career Change

I am an Electronic Engineering professional. I am mostly interested to work in Aircraft, Aviation related environment from my boyhood. But unfortunately, Due to family situation I have diverted in to sales field after my graduation since Protected content .
Now I have 5 years of experience in technical and sales. But I am still interested to work in aviation field.

Please, Anyone please guide me that how will it be possible to change the career, what are things i need to follow to obtain my dream job..?