What is the most effective Greyjoy strategy to dominate the Game of Thrones board game?

The most effective Greyjoy strategy in the Game of Thrones board game is to focus on naval power and control of the seas. Use your Iron Fleet to dominate the waters and secure key coastal territories. Utilize your raiding ability to disrupt your opponents' supply lines and weaken their positions. Form alliances strategically and strike decisively to expand your influence and secure victory.