You can save yourself some serious time drawing by reusing lines instead of drawing over lines.  In order to make several lines a single object, you would need to make a multipolygon relation.

https://wiki.openstreetmap.org/wiki/Relation:multipolygon

You can find working examples of this at https://www.openstreetmap.org/relation/18643736 and surrounding vicinity.
            ---
            
            Published using OSMCha: https://osmcha.org/changesets/162107843
            