I would say stop the shunning would be number one. I know they say their reason for shunning is to "protect" their members, but it does more harm than good, strike that. It does no good. Someone once said a long time ago on this site, that studies have shown that shunning is the worst thing that can be done to a person's mental well-being. I don't remember what all they said, but that was a just of it.
But then again those people, at least my relatives who are JWs, are the most TOXIC people on the face of the earth. So in a way shunning does do some good, it keeps those people the out of my life and stops them from playing their mind games on me and my children.
To tell you the truth, I DO NOT want them to change, I want my JW relatives to see them for what they really are. And the only way that will ever happen is if that cult dies out in a very pitiful way, aka a whole lot more members leaving than coming in. Less money coming in, aka donations, and more money going out on lawsuits, and the truth of what they really are.