Politics

Growing empathy for other people as well as enjoining the good and forbiding the evil contribute to nafs purification/self refinement. A hadith says if a change for betterment cant be achieved through action, then we should let people know what is the right thing. If this is not possible, we at least know what is right and this is the lowest form of imaan (thus least purified self).

Getting involved into politics is neither a sentimental let-off nor a career path, it should be a part of self purification effort.