No. There is nothing that the trinitarians can do to prove it. What they use are weak and irrelevant arguments from scriptures that are spurious and controversial. They just have their pet scriptures, but when examined they don't work.
And they will say the same about you.
Both sides have different fundamental ideas about what it means to be "a son" of anything. To you, it implies separateness. To them, continuity of nature.
What does it mean to be a man? To you it means something physical - which is the opposite of God, which is spirit. To them, the physical is only one part, and that doesn't contradict the being spirit at the same time.
For them, to be "man" implies a set of characteristics that make you a member of the category "man". Likewise there is a set of attributes and abilities that can only put you into the category of "God". To you, "God" isn't even a category, but a singular thing.
For you, "spirit" is not unlike "the nature" of certain creatures, even God. To them, "the nature" of something is much more than "spirit" and, again, implies "category".
I could go on and on... just look at the word "death" a few posts back.
These threads end up in these cycles because you are speaking right past each other. Both sides operate with radically different definitions of just about every word that matters on this topic. That is why both sides can quote the same scripture, the exact same one, and yet both sides will act like it soundly ended the debate.
Meanwhile, the patient continues to bleed.....