Aggregating metadata records from repositories and other data providers in order to provide regional and global discovery and analytics services requires metadata normalization. The quality, consistency and interoperability of metadata in repositories, therefore, is an important aspect that can influence the quality of these services and ultimately, the value of repositories in general. Repositories follow consistent guidelines, protocols, and standards for interoperability such as OpenAIRE Guidelines. The guidelines set important requirements with regards to the integration into repository platforms and have gained geographical significance, on the other hand, the current process for contributing to the development of guidelines is not representative of the expanding user community, nor is it well understood to those outside of OpenAIRE. There is an opportunity to formalize the approach and governance of the OpenAIRE guidelines to reflect their evolution. Based on this context, COAR is proposing to undertake several activities that will contribute to improving the quality, comprehensiveness and alignment of metadata in repositories internationally. While there are other efforts to improve scholarly metadata, such as metadata2020 and the RDA Metadata Directory, the activities outlined in this roadmap will specifically target the repository community by working with regional networks and other regional associations, who have more direct access with the local organizations managing repositories. This document outlines the rationale and roadmap that will help advance alignment of repository metadata and begin to define a more representative governance structure for the OpenAIRE guidelines that are starting to be adopted outside of Europe.