Want proof from the other Gospels that Jesus is God? Try some of these:
Matt 16:15-17, Jesus said to them, "But who do you say that I am?" Simon Peter answered, "You are the Christ, the Son of the living God." And Jesus said to him, "Blessed are you, Simon Barjona, because flesh and blood did not reveal this to you, but My Father who is in heaven."
Mark 3:11, Whenever the unclean spirits saw Jesus, they would fall down before Him and shout, "You are the Son of God!"
Luke 1:35, The angel answered and said to mary, "The Holy Spirit will come upon you, and the power of the Most High will overshadow you; and for that reason the holy Child shall be called the Son of God."
Lu 22:70 - And they all said, "Are You the Son of God, then?" And He said to them, "Yes, I am."
The fact that Jesus declares Himself to be Deity is recorded in "all" the Gospels, not just the Gospel of John.
Luke records on the Day of Pentecost that Jesus is both Lord and Christ (Acts 2:36).
The only question that remains to be asked is this:
Brethren, what shall we do?" (Acts 2:37)
Answer:
Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit. For the promise is for you and your children and for all who are far off, as many as the Lord our God will call to Himself." (Acts 2:38-39)
Blessings