Long rooms become easier when the furniture creates two small conversations instead of one long corridor. Float the sofa slightly, then use a rug or lamp to define the sitting zone.
Shape the room
Leave a clear walking line along the longest wall. Place a slim chair or plant at the far end to give the eye a destination rather than a dead stop.
Let it earn its place
The room will feel wider because movement and rest have clear lanes, even though the footprint has not changed.