Well I think you have a good sense of things yourself. You may not YET have leadership at your volunteer place, but why not try and lead some there? and in fact in every other activity you are involved in. It's simpler than you think. Say you volunteer for a church organization. Offer to throw a fund raiser. And then put your heart in it. Only good can come out of it.
Other than that, the single most impressive thing that helps is getting promoted lots. I know this isn't entirely in your control, but what you can get here would be good.
Other than that, since you have two years, involving yourself in one or two more activities, especially ones that may provide you opportunities to lead can be great too.
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