One of the key factors that affects your PPC account performance and ROI is your account structure, which is how you organize your campaigns, ad groups, keywords, ads, and landing pages. A well-structured account can help match ads to relevant keywords, improve quality score and ad rank, lower CPC and CPA, increase CTR and conversion rate, manage budget and bids more efficiently, and segment and target audiences more effectively. To optimize your account structure, you should review and audit campaigns, ad groups, keywords, ads, and landing pages regularly. Check for duplicate or overlapping keywords, irrelevant or low-performing keywords, negative keywords that can exclude unwanted traffic, ad copy that is clear and aligned with keywords and landing pages, landing pages that are relevant and optimized for conversions, as well as budget and bid adjustments that can improve ROI. Additionally, you should test different variations of your account structure elements to find the optimal combination that works for your goals and KPIs.