I like the first answer. I too believe this is an intensely personal question. On that note, I will answer it for myself in the hope that my story might encourage you or at least spark some ideas.
I attend an evangelical Christian church. On a weekly basis, there is talk of "evangelism" and how to do it. I find that there seems to be much emphasis (in the Baptist denomination especially, but perhaps others as well) on mission work, money for missions, and "relational evangelism" which is basically sharing your faith with friends.
On thing I think is terribly overlooked however, is the capacity parents have for spreading faith. It is pretty widely accepted that the Muslim faith is one of the largest (if not the largest) world religions, and is rapidly growing. It could be argued that Muslims are not necessarily evangelism oriented. So why is this religion so huge? Big families. Muslim parents are raising children in a faith that is strong enough to cause those children to eventually adopt it for themselves and spread it to their own kids.
My current faith focus right now is on my family. My husband and I are raising two daughters. It is not my current aim to "convert" the world to Christianity, but raising my children to understand my faith (and hopefully choose it for themselves one day) is my current pursuit.