Good luck with this, as in other occasions in what some managers tried to open discords, I think that the most common way to connect with others is the own facebook chat... different are the games .io for example, or some strategy games etc that have no way to stay in touch with the friends.
So I mean is not so easy to bring the people to discord, as is not strictly needed for the other ways that exist, but good luck with it as Ive said.