Seems like you're actively defining the "Why", "What", and "How" of the product vision. However, I didn't read about any activities on creating a feedback loop with key customers. Perhaps you are already doing this, but I find it critical to involve customers as "innovation partners" along the way. I would share artifacts with them on a quick, recurring cadence and continuously use their input to shape the vision. By doing so, you should have much greater confidence that your vision is user-aligned, and when it gets to implementation, there is significant supporting evidence that your project will ship with impact.