There is not a one-size-fits-all approach. And if people do not want to research on their own, they are not going to wake up.
I assumed even when I was DFed that even if the Bible was not divinely inspired, JWs had the closest interpretation of it. I was shocked to learn how many things were not really "Bible-based" and fell apart on examination or was just inconsistent. For instance, take "door to door", the Great Crowd/Other Sheep, ect... I thought 587/586 BC was fuzzy historically, some sort of guess by archaeologists, and that 607 BC was the date the Bible pointed too.
It's all part of fact-checking. But unless a person wants to confirm these things on their own, it will all go right past them.