Bravo! If nothing else, you are a gifted writer. I too wrote my own prayer. Maybe it will help you.
“Life is a gift, beyond cost or measure. Thank you God, for the gift of life. Thank you for the life of my friends and family. Thank you for my life.”
I don’t think it really matters whether or not there is a God to hear such prayers. Truth is it’s own reward. That should tell you something.