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You are practicing a bit of sophistry here. God refers to himself in the plural, the fact the word is plural is not even debated. Those who argue against it do so against the grammar and context, saying even though it is plural it "really is singular here," not form any academic position but because they disagree with God as a plurality.

I addressed the "20 issue" I stated the only thing left is how many and Biblically the Bible has plenty to indicate the plurality of God is triune.

As to only found in the New Testament I guess you forgot about these verses which clearly demonstrate God as a plurality.

Genesis 1:26 – “Then God said, ‘Let us make man in our image, after our likeness; and let them have dominion over the fish of the sea, and over the birds of the air, and over the cattle, and over all the earth, and over every creeping thing that creeps upon the earth.’”

Genesis 11:6-7 – “And the Lord said, ‘Behold, they are one people, and they have all one language; and this is only the beginning of what they will do; and nothing that they propose to do will now be impossible for them. Come, let us go down, and there confuse their language, that they may not understand one another’s speech.'”