Act as a seasoned digital marketing strategist with 10+ years of experience in Google Ads. Craft a step-by-step guide on how to create a high-performing Google Display ad, covering key elements like [TARGET AUDIENCE], [VISUAL DESIGN], and [AD COPY]. Include best practices for optimizing [AD PLACEMENT], [BIDDING STRATEGY], and [CONVERSION TRACKING]. Provide actionable tips for A/B testing different [CREATIVE VARIATIONS] and leveraging [AUDIENCE SEGMENTS] to maximize ROI. Explain how to analyze performance metrics like [CTR], [CONVERSION RATE], and [ROAS] to refine the campaign.