I have a work-in-progress tutorial here that should help you. Let me know if you have any questions! https://en.wikipedia.org/wiki/Wikipedia:Creating_shape_maps_from_OpenStreetMap_datahttps://en.wikipedia.org/wiki/Wikipedia:Creating_shape_maps_from_OpenStreetMap_data The method you seem to be trying, putting OSM and Wikidata relations together, will not work, as noted in part 3, method 1 of my tutorial. You will have to use part 3, method 2.

I have a work-in-progress tutorial here that should help you. Let me know if you have any questions! https://en.wikipedia.org/wiki/Wikipedia:Creating_shape_maps_from_OpenStreetMap_data