I understand the issue. The long and narrow room makes the layout a little awkward. One thing you can do is split the room into two seating area. Leave the long sofa with arm rests where it is. Opposite that you can place the single seaters at an angle. (preferably avoid placing them at right angles). and thanks the Diwan to the other end with perhaps two or three pouffes. You can shift the TV a little more and center it to one seating space.
Don't try to use the whole area as a single unit because that is an awkward space.
Miloni Mehta
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