Your answer was a straw man. You don’t think Christ KNEW beforehand His death would allow the saved to be in heaven? Of course He knew. He could have easily instructed people to pray that way knowing this.
Instead we find Christ, when He was directly asked by the apostles, “Lord, how should we pray?” and He said, “Our Father,.....” It’s a reliable example from Jesus’ own lips to pray to God, our Heavenly Father, directly.
I think you’d like praying the Rosary. You should try it. The “Our Father” is a big part of the Rosary devotion.:) Many Saints have prayed the Rosary. Perhaps it will help you.
I do not pretend to understand WHY God does what he does and doesn't do what he doesn't do. He COULD have told us to do something to prevent the rise of Islam, but he didn't. He COULD have told us about the Internet, but he did not. The absence of evidence that he wished us to ask the saved for intercession is not evidence of the absence of his desire that we do so. Christ did not die at the crucifixion, he is very much alive, and perfectly capable of expressing his intentions to us on earth.