Jesus became the expression of God's character (Logos) which is why he now has the title of "Word of God".The Word in John 1:1 was another spirit person next to God, not an abstract thing.
We know that because before writing John 1, John already knew that the Word is a name of Jesus in heaven:
Rev. 19:11 I saw heaven opened, and look! a white horse. And the one seated on it is called Faithful and True, and he judges and carries on war in righteousness. 12 His eyes are a fiery flame, and on his head are many diadems. He has a name written that no one knows but he himself, 13 and he is clothed with an outer garment stained with blood, and he is called by the name The Word of God. 14 Also, the armies in heaven were following him on white horses, and they were clothed in white, clean, fine linen. 15 And out of his mouth protrudes a sharp, long sword with which to strike the nations, and he will shepherd them with a rod of iron. Moreover, he treads the winepress of the fury of the wrath of God the Almighty. 16 On his outer garment, yes, on his thigh, he has a name written, King of kings and Lord of lords.
The Word was a spirit person, and later a person of flesh and blood, until he died.
Could God no longer speak?... suddenly become mute and unable to express any further words when the Word became flesh?
Matt. 3:17 Look! Also, a voice from the heavens said: “This is my Son, the beloved, whom I have approved.”
The Lord was, is, and will be the complete manifestation of the Law and the Prophets, in whom they find their full and absolute fulfillment. It is noteworthy that, while the Gospel presents the title of The Word or The Logos in an absolute sense (John 1:1), here it is qualified as “of God.” In this sense, it can be said that “the Word was God”—not in the Trinitarian sense of ontological identity, but because it was “of God.” The title is fitting for the Lord, for he fulfilled and confirmed the promises made to the fathers (Romans 15:8).