How can I take my skills and experience in product development and turn them into a compelling offering to sell as a consultant?

== My Short Story == I am a generalist software engineer with 4+ years doing product development at a tech startup. I recently left a full-time job to pursue consulting on my own. My plan is to focus on 1 or 2 narrowly-defined types of projects and present them in the context of their business value (e.g. "do X to reduce churn") to justify a higher rate. I am struggling with how to analyze my broad experience doing product development and come up with 1 or 2 specific types of project to sell. == Bullets about Me == - full-stack LAMP developer for 6+ years - worked on many types projects (everything from building APIs to internal support tools to large single-page apps) - lots of experience discussing problems with internal users and external customers - comfortable talking through high-level business goals and then turning them into technical tasks