How does preaching glorify God?

The act of preaching serves to highlight God's sovereignty and grace in the plan of salvation. 1 Corinthians 1:27-29 presents that God chooses what is foolish in the world to shame the wise, ensuring that no flesh might boast in His presence. Preaching the gospel exposes human weakness and underscores the power of God to save. It directs our focus to Christ and Him crucified, which fulfills God's plan and glorifies Him, as it is through the proclamation of the Gospel that God draws His elect unto Himself, thereby ensuring all glory is directed to Him.