>> “The Bible Itself declares that it doesn’t contain everything.” <<
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It does no such thing!
You have completely twisted the meaning of the verse.
The verse says that John’s account doesn’t describe each and every adventure of the Lord’s life on Earth, but the Bible as a whole states in many places that it does contain everything that we need to find eternal life in the presence of God through belief in his Son.
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Well, if John’s account doesn’t include everything, then parallelling that, the bible does not contain everything.
Are you saying that the Apostle John, who wrote his Gospel after all the other Gospels is lying?
Or are you saying that you do not believe the Gospel of John and therefore do not believe the entire Bible?
ALL the books, not just the Protestant Bible.