It would be great to have ephemeral text in the compose box in fediverse apps, that vanished as soon as we tap on the box to start typing. It's default could be a friendly greeting from the developers, but each could change it to whatever they wanted for their own app. I would put;
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Be patient with yourself, and others. Spend longer reading, and thinking, than typing and editing. Don't feed trolls, including concern trolls. Ignore, Unfollow, Mute, Block, or Report as appropriate. Leave your device and eat or go for a walk as necessary. Try to love everyone, even if you don't like them or associate with them.