This report documents the creation and development of professional networks under Task 6.3 of the Skills4EOSC project. The sub-task supported the establishment of national data stewardship networks in Italy, Portugal, Hungary, and the Nordic region, each tailored to local needs but harmonised through international collaboration. This collaboration is formalised through the creation of a global forum—Task Group 7 within the RDA Professionalising Data Stewardship Interest Group—ensuring continued knowledge exchange and sustainability beyond the project’s lifespan. The report also highlights the success of the Open Science Community Incubator Program and efforts in establishing two thematic networks: a FAIR Data in Health Technology Network and a Museum Curator Network for FAIR Data, which aim to foster domain-specific engagement with FAIR and Open Science practices. All efforts were underpinned by Skills4EOSC’s strategic guidance, resource sharing, and coordination.