Another good Bitcoin group: https://matrix.to/#/#Bitcoin:usethe.tools

Monero: https://matrix.to/#/#monero:monero.social https://matrix.to/#/#monero-punks:libera.chat

Privacy: https://matrix.to/#/#optout:monero.social https://matrix.to/#/#anonymity:matrix.org

Agorism: https://matrix.to/#/#cryptoagorism:halogen.city

Crypto Marketplace: https://matrix.to/#/#cryptomarketplace:matrix.org

Also try Schildi.chat. Its UI is easier to read than stock Element (chatboxes instead of paragraphs, message previews in the sidebar, organize your chats).