The short answer
Compare the customer problem, audience assumption and proposed approach behind each idea. Different headlines around the same promise are usually variations of one direction. Ask for approaches that make different choices, then explain which choice best fits what you know about customers.
A closer look
Put the ideas side by side and describe each without using its headline. If every description reduces to the same claim, ask for a new starting point: a different customer concern, piece of evidence, or way to explain the offer. More wording options may help production, but they do not necessarily widen the strategy.
For example, a campaign could explain the buying process, address a specific risk, or demonstrate a result with approved evidence. Each direction needs support from the business and its customers. The process in how to brief AI can help you give that exploration a purpose.