I will create a product that captures user data, such as my Twitter, my Facebook, my history, and my other footprints, and I can selectively control them,
Another product is Brain, which may be a note-taking software that helps me organize knowledge and search for questions and answers.
Of course I'm also building a product like this now
I would probably build a smart planner bundled with a mindfulness app to optimize productivity and mental well-being, addressing the balance often lost in our busy lives.