So you're looking for a Trinity tie from the NT to the OT. Consider these verses from Isaiah 48:12-16,
12 "Listen to Me, O Jacob, even Israel whom I called; I am He, I am the first, I am also the last (Rev 1:8).
13 "Surely My hand founded the earth, And My right hand spread out the heavens; when I call to them, they stand together (John 1:3).
14 " Assemble, all of you, and listen! Who among them has declared these things? The LORD loves him; he will carry out His good pleasure on Babylon, and His arm will be against the Chaldeans.
15 "I, even I, have spoken; indeed I have called him, I have brought him, and He will make his ways successful.
16 "Come near to Me, listen to this: From the first I have not spoken in secret, from the time it took place, I was there. And now the (1) Lord GOD (John 6:27) has sent (2) Me (John 8:18), and His (3) Spirit (John 16:13-15)."
Genesis 1:26, "Let Us make man in Our image, according to Our likeness."
Deut 6:4-5, "Hear, O Israel! The LORD is our God, the LORD is one. You shall love the LORD your God with all your heart and with all your soul and with all your might."
John 10:30, "I (Jesus) and the Father are one."
If you can't see the Trinity tie from the OT to the NT from these verses, then maybe the problem is that you are rejecting the truth that you have been given, and the work of God that Jesus declared you must do in John 6:28-29,
Therefore they said to Him, "What shall we do, so that we may work the works of God?" Jesus answered and said to them, "This is the work of God, that you believe in Him whom He has sent."
John 6:44 "No one can come to Me unless the Father who sent Me draws him; and I (Jesus) will raise him up on the last day.
Blessings