For such a huge changeset, can you split it into multiple uploads in the future?
To avoid conflicts and as a courtesy to reviewers, it is recommended to:
Combine changes in a small geographical area within a (city, district or province)
Keep changes within the same (country)
Upload/Save changes before moving on to map in a different area.
See: Changeset. Changeset - OpenStreetMap Wiki. (n.d.). https://wiki.openstreetmap.org/wiki/Changeset