Optimizing costs in cloud services involves several strategies. First, understanding the pricing model of your provider is crucial. This includes knowing when you’re billed and for what resources. Second, utilizing auto-scaling features can help manage costs by adjusting resource usage based on demand. Third, consider reserved instances for long-term workloads as they often come at a discounted rate. Fourth, regularly review and monitor your service usage to identify any unnecessary expenditures. Fifth, use cost management tools provided by your cloud service provider to track spending. Lastly, deleting unused or idle resources also helps reduce costs.