Where Should I Go From Here? [on hold]

My freshman year of highschool just ended and I'm ready to learn more programming this summer. My question is, what should I learn next? At this point, I know Python, C++ and Unity 3D (I can use C# and JS in Unity). However, I would love to learn a lot more so that I'm ready for whatever I want to do in college. So, I have two things I would love to learn: Android app development, and web development. I started the tiniest baby steps of both, and would love to know which I should focus all my attention on. From my point of view, both would be beneficial, but I know the mobile market is growing rapidly. Any help is greatly appreciated!