Personally serving others has a great positive impact on the world's view of Christians and Christianity. It has much more impact than the work of great speakers or expositors. Those who serve by doing menial, low-profile work should not feel that they are less valuable to God. God honors those who responsibly and diligently carry out what He has called them to do, whether it be pastoring a church or waxing its floors. Teaching - Teaching is different than prophecy.
Teaching mainly entails the interpretation, exposition and explanation of the Bible.
Encouraging - We all appreciate a word of encouragement. I dare say that we can all serve the Lord at one time or another using the gift of encouragement. Giving - Some are endowed by God the talent and ability to make money in this world. However, the gift of giving is not limited to financial giving. You can give services, talents, time, etc.