Turn off notifications for channels that aren't relevant to you. I have 3 channels that I get notified on every message, the vast majority only if I get mention

Turn off notifications for channels that aren't relevant to you. I have 3 channels that I get notified on every message, the vast majority only if I get mentioned, and some that have notifications disabled. Also chastise (professionally) people that abuse @channel for things that don't warrant interrupting everyone.