Hi there and thank you for the kind response. 

For this changeset I used Overpass to download landuse multipolygons with many members. I used regressions to also download everything that was attached to the members of those multipolygons. Then I cut up the multipolygons in JOSM mainly with the relation toolbox plugin and utilsplugin2.

Downloading everything that is attached to the relation members is important so you can safely edit the landuse multipolygons without interacting with other objects (roads, boundaries, other relations etc.) that are used as the edges of the multipolygons. Sometimes this still goes wrong when you reconstruct a natural=* multipolygon that uses a coastline or cliff as a member, because the natural=coastline/cliff may get retagged as a natural=wood/wetland/scrub/rock by JOSM's relation toolbox plugin. 

I hope these tips can help you. If you need help with anything more specific you can send me a private message or find me hanging out in the OpenStreetMap World Discord server. 
