When dialogue sounds interchangeable, I put each speaker's immediate goal beside the page. Then I read the exchange without the tags. Try this on one scene: 1. Write what each person wants the other to do before the scene ends. Make it an action, not an emotion. 2. Mark any line that exists only to give the reader information. 3. Let the speaker use that information to bargain, refuse, warn, or evade. 4. Hide the tags again. Can you tell who is speaking from the choices they make? A guard wants a gate shut at dusk. His sister wants it open until their brother gets home. They can discuss the rule for a page, or she can say, 'Give him until the second bell,' and he can answer, 'I already did.' Now both lines carry a decision and a cost. If you have four lines that feel flat, bring them here with each speaker's goal. We can test one change together.