So if this is true:
"Through him let us always offer to God a sacrifice of praise, that is, the fruit of lips which make public declaration to his name."
So, our main focus in preaching should be on praising God. This is more important than saving people, as Jehovah is more important than humans.
That being the case then the JWs should all be taking singing lesson and learn how to play an instrument. I'm mean if that is more important then they should be working up some really good songs, that is really the better way to praise him:
Great God Jehovah Father Supernal
You rule a Soviegn in Heaven above