If you can’t put what you’re asking into one sentence, you probably need to work on it. You need to think through what is in and out of scope, and why. Be honest if something is out of scope — you don’t want to set unrealistic expectations, and members of the public tend to be understanding if you are open and honest about what isn’t in scope.
Think about who to engage in your process. A reflective sample can be powerful, but it isn’t always what is needed for your situation. If you are going for a reflective sample, you might want to stratify your participants based on a particular lived experience (for example, poverty or economic insecurity), as well as demographics, geographies and/or attitudes. A mixed method approach might be useful to hear from both specific groups and a reflective sample. You might want to combine a broad reach approach, using a tool like Polis, to feed into a deliberative process.