I believe that God shows us how to pray in His model prayer. First it's to praise Him, then it's to submit all our requests and petition Him, and then it's about Him and His glory again.

I don't think not talking or asking God for things is letting go.... but letting go is when we just cannot do anymore and instead of still trying in our own effort, we turn it over to Him and trust Him to take care of it for us, like any good father would want to do for his child. I think it's harder for those who grew up without any good parent role model, especially not having a loving father. It's important to not compare our heavenly Father with a bad earthly father.

Lean back into His chest and arms and tell Him, "take care of it Daddy". (Actually in Hebrew one of the words for God translates "Papa". I like that.