What did xerxes do to make the battlefield of thermoplyae look like a victory?

Xerxes sought to portray the Battle of Thermopylae as a victory by showcasing the overwhelming numerical superiority of his forces against the vastly outnumbered Greek defenders. He emphasized the eventual Persian conquest of the pass, despite the valiant stand of King Leonidas and his troops. Additionally, he utilized Propaganda to amplify the image of Persian strength while downplaying the fierce resistance they faced, thereby framing the battle as a triumph over a smaller, yet heroic, enemy.