God the Father
What will the Holy Trinity God do? Of course, you can list the numerous ministries of the Trinity God, but the work of the Trinity God is aimed at:
All the work of God the Father is aimed at saving us by sending Christ, the Son of God, to this earth.
All the work of Jesus, God the Son is aimed at revealing that He is the Christ and fulfilling the work of Christ.
All the work of God the Holy Spirit aims to make those who will be saved realize and believe that Jesus is the Christ, and to preach this gospel of Jesus as the Christ to the world through the saints.
God the Father anointed and established Christ.
Ps 45:7 Thou lovest righteousness, and hatest wickedness: therefore God, thy God, hath anointed thee with the oil of gladness above thy fellows.
And God the Father sent the Son of God, Christ, to this earth to save the world.
Jn 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
And God the Father made His Son die on the cross in our place to save us.
Rom 8:32 He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things?
God the Father sent His Only Begotten Son into this world to make His Son a fellowship sacrifice on the cross to atone for our sins.
1 Jn 4:9 In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him. 10 Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins.
God the Son, Jesus
God the Son, Jesus has revealed that He is the Christ sent by God.
Jn 4:26 Jesus saith unto her, I that speak unto thee am he.
Mt 16:16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God.
And God the Son, Jesus was crucified on the cross to forgive our sins.
Rom 5:8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
And God the Son, Jesus completed the work of Christ on the cross.
Jn 19:30 When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.
God the Holy Spirit raised the dead Jesus back to life.
Rom 1:4 And declared to be the Son of God with power, according to the spirit of holiness, by the resurrection from the dead: God the Father raised Jesus, who died.
God the Holy Spirit
God the Holy Spirit works to testify that Jesus is the Christ.
Jn 15:26 But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:
God the Holy Spirit works to make us remember and understand the words of Jesus.
Acts 1:8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
God the Holy Spirit comes to those who believe in Jesus as the Christ.
Acts 5:32 And we are his witnesses of these things; and so is also the Holy Ghost, whom God hath given to them that obey him.
God the Holy Spirit makes those who believe that Jesus is the Christ to preach this gospel to all over the world.
In conclusion, God the Father sent Christ to this world to save us, God the Son, and Jesus revealed that He is the Christ and completed the work of Christ, and God the Holy Spirit convinced those who will be saved that Jesus is the Christ and made them believe, and also through the saints, He spreads the gospel all over the world.