Could have further explored Hirogen culture and added an aggressive voice of agreement with Janeway. Spend a couple episodes looking for his lost son. Make him a security officer to butt heads with Tuvok. Though, I will say that Seven had enough mentors to choose from by that point.
VOY s6e15 “Tsunkatse”
I always forget that’s J.G. Hertzler. It’s like…the less elaborate prosthetics he wears, the less I recognize him. See also: Laas in DS9.
(At least, until he speaks)