It probably makes sense to find one or two allies in the group (by talking offline) before proposing the change. I think that's how they did it for my older kid

It probably makes sense to find one or two allies in the group (by talking offline) before proposing the change. I think that's how they did it for my older kids WhatsApp group. (I'm not sure because I was one of the obnoxious parents who refused to install WhatsApp in the first place. I was a bit surprised when the group suddenly decided to move to Signal)