I am a sales & marketing executive knocking on doors (but getting nowhere). Are there any suggestions how a really professional value proposition is made?

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The way to make a value proposition is to understand the customer’s needs, then show your solution to their problem. This means that you need to listen and then respond (i.e., interview THEM), not attempt to sell off-the-bat. Once you’ve established a rapport, and understand their problem, then you’re in a position to present something of value, that’s on-target and with a clear benefit to the customer