There are three Discord servers not currently listed on the Classic Discord site:
The server for Old Blanchy, US West PvE Realm:
URL: discord.gg/UUexE6Z
Classy Classic US, a family-friendly server with channels for all US East & US West realms:
URL: discord.gg/bmKYAUm
Classy Classic RP, a family-friendly server for role-players & role-playing regardless of realm played:
URL: discord.gg/MAdAz4C
The Classy Classic servers are newer, so their populations are growing. The Old Blanchy server is established.
The thread for the opening of the two Classy Classic servers is here if their purpose and benefit is not as self-explanatory: