Jesus wanted the man to show himself to the priest. It was important to have their endorsement of being healthy. That was the appropriate step to be restored into the community.
Jesus did not want his healing ministry to overshadow his message of the Kingdom. He told the man to go to the priest and not talk openly about the healing.
Instead the man went everywhere telling people about his healing. People became more interested in Jesus as miracle worker than as the truth-teller of the Kingdom.
When Jesus makes us pure, there are usually some steps we should take to deepen the effect. He told the man set from a Legion of demons to go home. He told the woman caught in adultery to go and sin no more. He told Lazarus to come forward when raised from the dead and instructed others to remove the grave clothes.
The miracle is not the central goal. It is the catalyst for restored life. We need to ask for God’s help and we need to listen for the steps that follow His intervention.