Interoperability is a well-known challenge when dealing with data, especially open data. Several guiding principles and best practices are recommended to publish data and enhance interoperability. RDF is a standard data format for interoperability within the Semantic Web field and Linked Open Data initiative. Several tools and mapping languages have been proposed to convert data of usual formats to RDF but they are still difficult to adopt sustainably by data producers because of technical expertise requirements as a first barrier. In this paper, we introduce a methodical approach to convert to RDF open data existing in various usual formats. This approach is designed to encourage data producers without a deep Semantic Web expertise to semantically and sustainably lift their data. We also describe an implementation of this approach as a semi-automatic workflow for GeoJSON data format, and we discuss its preliminary results.