For those looking to get off Discord in the wake of this upcoming global age-gating, I'll put my Matrix down, and also link a directory of Matrix servers for you to join if you can't self-host.

My Matrix: @dfx4509b:unredacted.org

List of Matrix servers you can sign up for: https://servers.joinmatrix.org/

More info on Discord's global age-gating: https://discord.com/press-releases/discord-launches-teen-by-default-settings-globally