Writing a Discord announcement people actually read
Discord channels move fast, and an announcement competes with chat. Put the news in the first line ("Game night moves to Friday at 8pm UTC"), then the details, then what you want members to do: react, reply in a thread, or show up.
Use markdown to make the structure visible: a short heading, a bold date and time, a bullet list for anything with more than two parts. A wall of text in a busy channel gets skipped.
Pick "share news or an announcement" as the goal for this, and "start a discussion" when you want replies, such as a question for a #general channel or a weekly prompt.
Matching the tone to your server
Every server has its own voice. A study group, a game community and a brand's customer server read very differently, and members notice when a post sounds like a press release.
"Casual" fits most community servers. "Professional" fits support and product update channels. "Funny" works in servers where jokes are part of the culture, but keep the actual information easy to find under the joke.
The drafts are a starting point: add your server's in-jokes, emoji and channel mentions before you post.