>First, don’t live in the Americas or Africa, where murder rates (one in 6,100 and one in 8,000 respectively) are more than four times as high as the rest of the world.
Next, be a woman. Your chance of being murdered will be barely a quarter what it would be were you a man. In fact, steer clear of men altogether: nearly half of all female murder-victims are killed by their partner or another (usually male) family member. But note that the gender imbalance is less pronounced in the rich world, probably because there is less banditry, a mainly male pursuit. In Japan and South Korea slightly over half of all murder victims are female.
Then, sit back and grow older. From the age of 30 onwards, murder rates fall steadily in most places.