Ok, this is my opinion. It works for me. Your results may vary.
If you're going to be a Voice Actor, how about getting out there once in awhile and act?
Get on stage! Hit the community theater! Sharpen those acting skills!
I've landed the roll as "Mel" in "The Prisoner of Second Avenue" the Neil Simon play being produced at the Ghent Playhouse in May. I've also just confirmed that I'll be playing "Joe Boyd" in "Damn Yankees" at the MacHaydn Theater in July.
Go hit those boards! Wooooo!