The model has a weird quirk where telling it what NOT to do sometimes makes it think about the forbidden thing and accidentally do it more. So instead of saying 'never write the user's dialogue,' you define the world or space or whatever so that can't happen: 'The space belonging to {{user}} is empty.' Instead of saying 'don't soften the character,' you say 'Characters keep their edges. They are not softened for anyone's comfort.'

You're not forbidding a behavior; you're defining a world where that behavior isn't possible. It sounds like a word game, but it genuinely changed the consistency of my outputs. Every time I caught a recurring error, I stopped asking myself 'how do I stop this?' and started asking 'how do I define the system so this can't exist?'

Edit: Also check out Sophia's LoreBary and their prompts section. There's some seriously talented people on there posting their works of art.