Act as a Digital Marketing Strategist with 5+ years of experience in Google Ads. Provide a step-by-step guide on how to optimize Google Display ads for maximum ROI. Include best practices for [TARGET AUDIENCE], [BUDGET ALLOCATION], and [AD CREATIVE]. Explain how to use audience targeting, placement optimization, and A/B testing effectively. Also, cover how to analyze performance metrics like CTR, conversion rates, and impression share to refine campaigns. Tailor the advice for [INDUSTRY] businesses looking to scale their online presence. Be detailed and actionable, ensuring the recommendations align with Google's latest algorithm updates and ad policies.