I'm blessed because God's spirit lives in me as one eternally sealed by His grace.
I know who God is in verse 27. Because the verse tells us it is God. You don't see that plurality in verse 27 because the plural reference disappears.
Had three separate beings created man,the plural identity would continue.
The others referred to in the verses prior are the angels in Heaven.
Consider this.
Who is G‑d talking to when he says, "Let us create man in our image"? If G‑d is the One and Only, why does he refer to Himself in plural form?
Answer:
Great question. In fact, the biblical commentator Rashi (Rabbi S

mo Yitzchaki, 1040-1105) asks the same question in his commentary to the verse (Genesis 1:26). Here is his explanation which is based on Midrashic sources:
"Although [the angels] did not assist Him in His creation, and there is an opportunity for the heretics to rebel, to misconstrue the plural as a basis for their heresies, Scripture did not hesitate to teach proper conduct and the trait of humility, that a great person should consult with and receive permission from a smaller one. Had it been written: "I shall make man," we would not have learned that He was speaking with His tribunal, but to Himself.
And the refutation to the heretics is written alongside it, in the following verse: "And G‑d created (וַיִּבְרָא)," and it does not say, "and they created (וַיִּבְרְאוּ)."