Declaring yourself to be God would be to glorify yourself as God. Jesus stated he did not seek his own glory. So when the Jews asked him WHO he was, Jesus stated that if he glorified himself his glory is nothing. But Trinitarians claim he did indeed glorify himself as their God and shamefully contradict the words of our Lord Jesus.

"I do not seek my glory..... The Jews said... "WHO do you make yourself out to be?” Jesus answered, “If I glorify myself, my glory is nothing. IT IS MY FATHER WHO GLORIFIES ME, of whom you say, ‘He is our God."" John 8:50-54

Was Jesus testifying about himself at John 8:58?
“If I testify about myself, my testimony is NOT true. There is ANOTHER WHO TESTIFIES ABOUT ME, and I know that the testimony which He gives about me IS true." John 5:31-32

Was Jesus glorifying himself at John 8:58?
The Jews said... "WHO do you make yourself out to be?” Jesus answered, “If I glorify myself, my glory is nothing."

"My teaching is not mine, but His who sent me. If anyone is willing to do His will, he will know of the teaching, whether it is out of God or whether I speak from myself. He who speaks from himself seeks his own glory but he who is seeking THE GLORY OF THE ONE WHO SENT HIM, he is true, and there is no unrighteousness in him." John 7:16-18

Jesus told us plainly that he did not come in his own name and he did not seek his own will nor did he seek his own glory. He came in the name of the Father not to do his own will but the Father's will and not to glorify himself but to glorify his Father by finishing His work. Jesus only testified about himself insofar as he obeyed what the Father willed to say through him and what the Father willed to do through him. Jesus tells us that he did not speak from himself but the Father spoke through him and he did not do mighty signs and wonders from himself but the Father did his mighty works through him (see also Acts 2:22). Because he obeyed what the Father wanted to do through him, the Father testified to who Jesus was by making Himself known through this man of flesh - two witnesses, the Father and the Son. (John 8:14-18).

The swaggering Jesus of Trinity world is a fake Jesus.