As you work on various projects, thinking about the direction you want to go with things and what your long term goals are will become more and more interesting. Think about where you'd like a project to head—where it'll be far, far down the road—where you'd like it to intersect with other projects in the near future or in the far or very far future!
Think about what you'd like to be able to do as a proto. What projects will take you there? What will help you get further along a path you want to take? Startup or work on projects that help you or other protos figure out what's next!