Why does Isaiah 45:5, and Deuteronomy 4:39, 32:6 use the personal pronoun “I, me, and he” in reference to God the Father? Does this mean that God is obviously unipersonal or one person?

Isaiah 45:5 KJV
I [am] the LORD, and [there is] none else, [there is] no God beside me: I girded thee, though thou hast not known me:

Deuteronomy 4:39 KJV
Know therefore this day, and consider [it] in thine heart, that the LORD he [is] God in heaven above, and upon the earth beneath: [there is] none else.

Deuteronomy 32:6 KJV
Do ye thus requite the LORD, O foolish people and unwise? [is] not he thy father [that] hath bought thee? hath he not made thee, and established thee?

Ex.
John 4:24 KJV
God [is] a Spirit: and they that worship him must worship [him] in spirit and in truth.

Ex.
Matthew 28:19 KJV
Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:

Of the Father - G3962
II). metaph.
A). the originator and transmitter of anything
i). The authors of a family or society of persons animated by the same spirit as himself
ii). One who has infused his own spirit into others, who actuates and governs their minds

Of the Son - G5207 - son of God
used to describe Adam (Lk. 3:38)
used to describe those who are born again (Lk. 20:36) and of angels and of Jesus Christ
of those whom God esteems as sons, whom he loves, protects and benefits above others
in the OT used of the Jews
in the NT of Christians
those whose character God, as a loving father, shapes by chastisements (Heb. 12:5-8)
those who revere God as their father, the pious worshippers of God, those who in character and life resemble God, those who are governed by the Spirit of God, repose the same calm and joyful trust in God which children do in their parents (Rom. 8:14, Gal. 3:26), and hereafter in the blessedness and glory of the life eternal will openly wear this dignity of the sons of God. Term used preeminently of Jesus Christ, as enjoying the supreme love of God, united to him in affectionate intimacy, privy to his saving councils, obedient to the Father's will in all his acts

The sons - H1121 - F). sons (as characterisation, i.e. sons of injustice [for un- righteous men] or sons of God [for angels]

I.e. sons represent the Law and are messengers of the Law which is God/angels G32 - Outline of Biblical Usage [?]
a messenger, envoy, one who is sent, an angel, a messenger from God

Of the Holy - G40 - Outline of Biblical Usage [?]
most holy thing, a saint

Ghost - G4151 - Outline of Biblical Usage [?]
the third person of the triune God, the Holy Spirit, coequal, coeternal with the Father and the Son

IV.) the disposition or influence which fills and governs the soul of any one

FATHER originator of a Family, First you are taught the Law of God which is by His Word, then He infuses His Spirit in you to govern your souls and all three are one. That’s the order of God as he gives us an example with our bodies in

Matthew 10:28 KJV
And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.

References:

https://www.blueletterbible.org
Lexicon/Strong’s Concordance
https://www.quora.com

https://christianbiblestudies.quora.com/Why-does-Isaiah-45-5-and-Deuteronomy-4-39-32-6-use-the-personal-pronoun-I-me-and-he-in-reference-to-God-the-Father