I know how hard it is to awaken people still inside the cult bubble. There are many reasons for this, chief among them the unwillingness to read or watch anything critical of their religion. On the other hand, JWs love few things more than hearing bad stuff about other faith groups.
With that in mind, maybe one 'tactic' could be to show JW family/friends documentaries like the recent 'Prophet's Prey' (2015) about the psychopathic, sexual predatory, paedophilic recidivist scumbag Warren Jeffs and the FLDS church. Just maybe, for a moment, they will look inwards and notice some uncomfortable similarities. After all, daring to think the unthinkable is what made me start asking questions.
Anyway, if you haven't seen the film it's well worth a watch. It's sickening of course but also, in many ways quite familiar.
The excellent movie 'Spotlight' could be worth a go too.