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”
LMAO, I watched it last night and didn’t even realize until reading this post. But yeah that’s martok’s voice alright.