In my opinion the most impactful thing you can do is write high-quality Linux apps. To be frank, if you try to fix some of the major issues with Linux (such as listed on that itvision.altervista.org page), you will have to fight a sort of bureaucracy where people won't accept a solution because it doesn't reach some absurd degree of elegance and configurability. You need a high degree of discipline to stay motivated while rewriting your code and proposing it multiple times. However, if you write your own app, you don't have to answer to anyone. Your focus is quite a bit simpler, just make a UI that users fall in love with.
