Are you really sure you want to keep that mega huge multipolygon? In Pennsylvania i'm cleaning up those currently, to have every single forest handled as a normal way, except if there are many holes in the forest.  Just as an FYI, because editing an entire forest with no known name, and having 300+ members makes every computer lag &c.

The exception is if this forest had a name. https://www.openstreetmap.org/relation/3334074
This forest entirely lies in the Mátra mountain range in Hungary, for example.