When man tries to shine or seek his or her own glory, what happens ? either his own glory is dim , short lived, and he or she is competing with billions of people in the planet. Eventually man will burnt out.
What happens when man reflects God's glory ? The principle is like the sun and the moon. The moon gets its light from the sun.
Man like the moon reflects the light from the source. For man the source is God. God shines through Jesus and the Holy Spirit and man receives or reflects God's glory.
But how can man do that ? Man is to spend some time with God through the Bible, churches, and mature Christians, prayers etc.
We reflect God's glory when we follow the teachings of Jesus Christ.