Hi, you have defined a private property here with the tag landuse=forest. This tag is generally used to define the boundaries of forestry activity. The area is already tagged as being a wooded area.
As the boundary does not appear to be a forestry area or forestry coop, I expect you instead want to show that the track crosses through private property. 
This is normally done by splitting the track at each end of the area that passes through private property and adding the tag access=private or other access tag as suits. If there are gates or fences or signs defining the private property you can also add those.  