Improving your ad relevance score is an important factor that can help you lower your ad costs and increase your ROAS. However, this isn't enough to optimize your ad budget. You need to monitor and adjust your ad performance and spending regularly. This includes setting a realistic and flexible budget that aligns with your goals, choosing an appropriate bidding strategy, tracking key metrics such as impressions, clicks, conversions, CPC, CPA, ROAS, and profit margin, analyzing results across different campaigns, ad groups, keywords, ads, and landing pages, identifying and eliminating underperforming or irrelevant keywords, ads, and landing pages that drain your budget, and scaling and expanding successful keywords, ads, and landing pages that generate high ROAS and profit. All of these steps are necessary for creating effective and efficient ads that reach and convert your target customers.