How do you gain a closer relationship with God? God is your father, and unlike man, he can never fail you and loves you deeply and unconditionally. Learn how to speak with Him. Learn all the names to Call Him.
God in His infinite mercy, power, love, kindness, holiness, and knowledge made a decision to reveal himself as "Abba, Father". Galatian 4:6, "And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father."
Abba, Father is a term used to describe a very personal and loving relationship, which is the basis and nature of our relationship with our Heavenly Father.
Just call Him Abba, Father, and He will answer you and bless you (Jeremiah 3:33).