As marketing agencies face uncertain economic conditions, it's essential to demonstrate the ROI of marketing spend. To efficiently uncover insights from client data without overextending resources, agencies can adopt modern data stack (MDS) practices, such as using fully managed ELT pipelines, cloud-based data warehouses or lakes, and business intelligence platforms. This allows data engineers to focus on more impactful aspects, like building a Composable Customer Data Platform (CDP), breaking down data silos, and providing actionable insights to clients. By centralizing marketing data and leveraging platforms like Fivetran, agencies can streamline processes, improve efficiency, and drive ROI for their clients. With flexible pricing based on usage, Fivetran enables agencies to grow and add more clients without increasing costs.