Aternos should add the plugin WorldServer
- This plugin separates chat, tab and economy so players will think they are on separate servers.
- Separate chat between worlds. This features a full chat control module. You can set the chat format and chat cooldown per world. You can also set the join/leave messages per world. This also supports a global chat, and a spy mode for admins.
- Separate the tab list between worlds or world groups.
https://www.spigotmc.org/resou…d-chat-tab-and-eco.99010/