We proposed a transition strategy utilizing Google Tag Manager, specifically through data layer-based custom tracking, which is generally considered a reliable method for data capture and tag management. A key element of this migration involved realigning the client’s existing tracking logic to fit the GA4 model, including adaptations in event naming and eCommerce tracking parameters. GA4 event-based tracking system offers greater flexibility and is designed to meet future analytics needs. Moreover, it supports cross-platform tracking, fulfilling one of the client’s specific requirements. Overall, the solution aimed to ensure both reliability and future-readiness in the client’s data tracking capabilities.