Most of what is attributed to the Father in the Old Testament is actually the Son (preincarnate).

For one... the Father created only one thing: the body of the Son (John 1:14b and Hebrews 10:5b). That the Son (preincarnate) is the sole Creator of all things created in the beginning.

Observe:

John 1:1-3 (NASB95)
1 In the beginning was the Word, and the Word was with God, and the Word was God.
2 He was in the beginning with God.
3 All things came into being through Him, and apart from Him nothing came into being that has come into being.

God the Word became a man (John1:14a).

Colossians 1:13-16 (NASB95)
13 For He rescued us from the domain of darkness, and transferred us to the kingdom of His beloved Son,
14 in whom we have redemption, the forgiveness of sins.
15 He is the image of the invisible God, the firstborn of all creation.
16 For by Him all things were created, both in the heavens and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things have been created through Him and for Him.

Isaiah 44:24 (NASB95)
24 Thus says the Lord, your Redeemer, and the one who formed you from the womb, “I, the Lord, am the maker of all things, Stretching out the heavens by Myself And spreading out the earth all alone,

And the Holy Spirit is the one who wrote the Bible:

2 Peter 1:20-21 (NASB95)
20 But know this first of all, that no prophecy of Scripture is a matter of one’s own interpretation,
21 for no prophecy was ever made by an act of human will, but men moved by the Holy Spirit spoke from God.

Both writing and non-writing prophets.

Discovering these unique things about the individuals of the Godhead bolsters Trinitarian theology and further establishes that they are not one another as the Sabellians / Modalists try to make God out to be.