You could be right that a fantastic lawyer may take this on but it would be virtually impossible to win for two main reasons.
The court, at least in the US, will have to ignore 100 years of US Court policy and precedent that civil courts cannot intervene within the internal matters of a religion. A court cannot determine if a religion is correct in their beliefs or how they practice those beliefs as long as it doesn't violate an actual law. It cannot get involved with the discipline of its members or who it determine's it members should or would be. Watchtower is a voluntary organization and can pick it's members at its whim and can remove those same members at any time.
The second is that you would have to prove damages and that those damages were caused by Watchtower and their practices. Even if you claim depression you would have to prove that the depression had it genesis because of your discipline within the JW community. That would be really hard for any psychologist or psychiatrist to definitively say that it the exclusive cause.
But if you think you have a case you should try and find a lawyer and try and file a civil case. If you think it is winnable and can convince a lawyer to take it on then you should definitely try.