Your failure at Greek Grammar proceeds you.
The highest expert on Greek Grammar, Daniel Wallace , notes that the translation "What God was, the Word was" is sort of the best way to express the translation. The concept then is that if God is the almighty, creator, glorious One, then the Word is the same.
You can read a bit about that at --
https://www.ntgreek.org/answers/answer-john1_1.htm
For Unitarian interpretations to be true, God would have to be reduced to language and words. So the unitarian must decrease who God is so that they can decrease who Jesus is. What is also bad is that unitarians have to distort grammar to do this distortion.