Stephen's campaign has been live for three weeks. He's noticing the CTR on his Promoted Videos is in decline. What could he do to optimize performance on low-performing ads? Select the best answer.

When ad performance declines, especially CTR, it often indicates creative fatigue. Refreshing the ad unit's creative, starting with headline copy, is an effective optimization strategy. The headline is a crucial element that grabs user attention and influences their decision to click. By updating it, Stephen can re-engage his audience and potentially improve CTR. Pausing the ads without attempting optimization misses an opportunity to improve performance. Decreasing bids might reduce costs but won't address the underlying issue of declining engagement with the current creative and could further limit reach.