The names escaping me but there’s a site you can use that turns your discord into a publicly accessible website / archive.

Check out mautrix-discord too if you’re a server admin, you can puppet everything there and switch seamlessly.

Matrix is very close to being a good replacement for discord.

I’ve just bridged all my chats using the mautrix bridges. All looks seamlessly puppeted on matrix. Even emojis and pinned messages make it across.

The Element X app which uses matrix 2.0 is lacking a few features (like spaces) but I think it’ll take over once they get it right.