The complete singleplayer world: overworld, Nether and the End as the server was shut down. Unpack the archive into your saves folder. Minecraft 1.21.10 — a newer version upgrades the world irreversibly, so play on a copy.
Chaos Event
Worlds
The whole season map: the overworld, the Nether and the End as they were when the server shut down.
The file is hosted on Google Drive — the button links there.