I think that the elves trying to gain their independence by force is basically suicide. I can't think of any conceivable way that would work out. Even if they take advantage of the chaos and get a solid foundation, they are one country of elves on a continent of humans. Any possible action they take will result in an escalating war of annihilation that they will lose. Again.
No, if the elves want autonomy, they need to do it how Shartan did: find a big, desperate conflict, and back the winner. The elves can only be independent with the consent of their neighbors, so they need to focus on securing that consent as soon as possible.