Every Christian is called to serve. Every Christian has a ministry. It is impossible to be a Christian without becoming a minister of Christ. In ancient society the slave had no rights but was totally at the command of his master. The New Testament writers deliberately chose this word slave to describe their relationship with Jesus.
Worship is a big word.
If not, it will certainly grow stale. It is widely used of practical help of all kinds. Since the coming of Jesus into our world we must no longer insulate the sacred from the secular. Ask yourself what differences becoming a Christian has brought to you in these areas of wholeheartedness, worship and practical service. Apply this to your church or group.