Deu 6:4 Hear, O Israel: The LORD our God [is] one LORD:
You say God is a plurality based on a name, yet the OT clearly states that despite implications of plurality, God is one.
Gal 3:20 Now a mediator is not [a mediator] of one, but God is one.
Even the New Teatament clearly states that God is one, not a plurality.
God is One --- just as the SHAMA of Deuteronomy 6:4 testifies to. God is a plurality [trinity] acting in unity --- as One. The Hebrew word for God [Elohiym] is plural and we saw that plurality just as Isaiah prophesied. They were all there at Jesus' baptism with the Father, the Son [Jesus] and the Holy Spirit united in testimony and purpose and then throughout the New Testament.