If your divinity is not fluffy, there could be a few reasons. Ensure the syrup is boiled to the right temperature (around 250°F or 120°C) and whip the egg whites to stiff peaks before adding the hot syrup. Beat the mixture until it thickens and holds its shape without overmixing it. Be cautious of humidity and moisture, as they can affect the candy's texture. Avoid stirring while boiling and use a wet pastry brush to prevent sugar crystals from forming.