Enforcement of the General Data Protection Regulation (Regulation 2016/679 or GDPR) is organized mainly alongside decentralized procedures, where national supervisory authorities (SAs) are responsible for monitoring and supervising the diverse market of small and large data controllers and processors. Since processing often has a transnational character, enforcement becomes a transnational affair too. Therefore, the GDPR lays down a (complex) cooperation mechanism according to which national SAs in different Member States shall coordinate the outcome of enforcement procedures, in order to address violations together – potentially with involvement of the European Data Protection Board (EDPB) too. While this procedure was, from the outset, infamous for its complexity, concerns regarding under-enforcement of cross-border cases now seem to materialize in practice. This blogpost highlights a number of recommendations that aim to increase the effectiveness of cross-border GDPR enforcement and the protection of data subjects within these procedures.