Faith is a personal thing. You can't give someone faith, and you can't take it away. Exerting efforts to actively convert jws is a waste of energy. You can't substitute your thinking for theirs, because they need to seek the information themselves, and they need to not be coerced. Some will make it, some won't. It's nobodies' place to be spiritual nannies.
In fact, any affirmative action to coerce jws to abandon their faith will simply increase their persecution complex and close their minds to questions.