I don’t think we’d see much of a change from what we have now in the NRA. You’d need a strong political arm to fight back the anti-rights activists intent on turning us into a nation of victims. You would also need public relations and finally (most importantly), training.
I do think that we need stronger advocates for reality based training as well as places to train. It used to be small arms practice was held every Sunday after church. Now fewer people go to church and places to shoot aren’t as close as the town square. We would still want to focus on rifle marksmanship for those who would serve overseas. We’d also need to cover concealed carry, pistol marksmanship, threat deescalation, weapons retention and threat avoidance.
I used to belong to a loose knit group of individuals who did just this. We would “formally” meet twice a month and practice handgun tactics. On occasion we would also throw in combat rifle and shotguns as well. We had military (current and former) law enforcement and others participating. If someone went to a gun school like Gunsite they would share what they learned and we would all improve. Besides making better shooters this created a real sense of community where people helped people and there were no strangers. I don’t think this group still gets together, but I moved away a life time ago. Wish I could find something like that again.