God is truly one in His Being (essence) indivisible—not having parts, nor components, nor committees, nor societies making up His Being—the ontological Being of God is simple and one. This is, in general, divine simplicity.The idea of God being both “One” and “multiple persons” presents a contradiction. Either God is truly One, indivisible in essence, or He consists of distinct persons.
The contradiction you posit in your writing rests upon the understanding of "person" as defined by our human experience, and not "person" as it is used with regard to the Father, Son, and Spirit within trinitarian doctrine.
I would agree with the above statement were the Father, and the Son, and the Spirit, to each have their own independent will and separate self-consciousness awareness—just as we each have.If God is divided internally into persons, that division contradicts the concept of true oneness, as even internal distinctions imply separateness. Unity in essence cannot allow for internal division without compromising the integrity of being one and undivided.
Instead, the Father, Son, and Spirit, have the one very same will and self-consciousness awareness that is God, Himself. Otherwise, as you have aptly pointed out in various posts three distinct individual wills and three separate self-consciousnesses will be speaking of three individual gods.
"Person" as it is used of the Father, Son, and Spirit, speaks only to the eternal relations of origin—Father, unbegotten; Son, begotten; Spirit, spirated—this is what distinguishes one person from the other; and, these relations subsist co-equally and co-eternally within God's Being without division.
I respectfully disagree with your conclusion.Therefore, asserting both oneness and multiplicity within God leads to a logical inconsistency.