The Good Citizen/ Freedom Vs. Fit

Aristotle believes the purpose of politics is to promote and cultivate the virtue of its citizens. The telos or goal of the state and political community is the “good life”. And those citizens who contribute most to the purpose of the community are the ones who should be most rewarded. But how do we know the purpose of a community or a practice? How does Aristotle address the issue of individual rights and the freedom to choose? If our place in society is determined by where we best fit, doesn’t that eliminate personal choice? What if I am best suited to do one kind of work, but I want to do another?