Clarity for Coaches

I am SUPER motivated to start creating my signature presentation, but Pat asked me to answer a question before I begin, which I'm struggling with....

"What problem do you solve?" 

What would be the best advice for coaches on how to gain clarity on what they want to focus on, but most of all, what 'problems' they are helping solve for their clients? 

I'm finding it difficult to take all of the "vastness" of what coaches offer, and skim it into only a sentence or two to explain to others (without forcing them to sit through a 20 minute explanation). 

Thank you for your consideration!!