The Clients You'd Clone
Your positioning is hiding in the small group of clients you'd most want to work with again.

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The mechanism
The chart is a four-box grid. Left to right is how much money a client is worth to you; bottom to top is how much energy and fit the work had. Each past client is a dot; the ones in the top-right "clone these" box, good money and great fit, are joined by lines. You don't invent positioning; you find the clients you'd repeat and name what they had in common.
Part of Positioning. Who you are for and why you are the obvious choice.