There are many things you can write about when it comes to the value of anyone's life. There are also so many different angles to take. Let me list a few.
First, you can talk about the importance of love and how a person who commits to a path of love can make a difference in the world. This person's life then would be of considerable value.
Second, you can take more of a religious approach. You can say that all people are created in the image of God and have inherent value. In connection to this, you can even talk about the love God has for people.
Third, you can talk about how each person is unique and how each person can play a role in the world in making the world a better place.