To improve your prayer life develop a higher view of God and a lower view of yourself. There must be a curious blend of both confidence and brokenness. The blind man in Luke 18:35-43 calls out to Jesus, "Son of David," that's a Messianic term whereby he expresses his faith in the Lord. "Have mercy on me." The blind man acknowledges his need and unworthiness.
Learn the lesson of Bartimaeus. Develop a high view of God and a low view of yourself. This is how you get results with God.