One of the more traditional ways to show how much we are thankful is through prayer to our Heavenly Father. He is the one who created us and who ultimately supplies our every need.
I think there is another way to show how thankful we really are and that is through testifying to others of the goodness and faithfulness of God.
King David did this in Psalm 66:16 when he said, "Let me tell you what he (the Lord) has done for me."
Jesus encourages us to share what good things he has done for us when he gave us an example in his communication with the demon-possessed man he had healed. He said in Mark 5:19, "Go home to your friends and tell them how much the Lord has done for you."
We need to be thinking about who we can share with what God, through Christ, has done for us.
As a result, lives can be changed and even more of God’s creation will offer thanksgiving to him.