ENVRI-FAIR is working towards the integration of (meta)data and service flows across the different environmental research infrastructures and to enhance the FAIRness of their (meta)data and services and enable efficient linking to EOSC. In this respect, FAIR Convergence of the participating research infrastructures will enable a tight integration of services and datasets from the participating ENVRIs, to the benefit of various stakeholder categories. Convergence, both technological and conceptual, will support integration with the European Open Science Cloud. The current report D5.6 on Synthesis and outlook evaluates the current status of the FAIR convergence efforts done on the subdomain and cluster level and provides strategic recommendations for the future developments of the ENVRIs and the ENVRI-Hub.