The scope of any consulting service should be determined by the goals of your ideal clients.
If you start with an idea in your head about what people want, you almost always get the specifics wrong. You need real-world input from your ideal clients.
At very least, have conversations with people in your ideal target market. Understand their pains and the context around their goals.
Build backwards from there.
You can do this in your research process, it doesn’t need to be done exclusively during sales conversations.
If you get clear on the goals of your ideal clients using real-world input, the scope and price takes care of itself.