Your argument in this article is that Ecclesiastes is part of the Bible Canon. You need to find ideas from the original texts of the original text that can prove that the Ecclesiastes is part of the Bible's canon to help you. I give you an example, just to explain, for example: it is said that Ecclesiastes is not part of the Bible, because it does not mention the name of God, Jehovah. However, this book has content that worships God, and repeatedly uses the word ha·'Elo·him', which means “real God”.