A better photo would help... There is NO
reason to tear it all down!
I see what you mean about the right side. It is a bit awkward. I do like the left side. I would not swap out the Rotala rotundifolia for Rotala wallichii. The R. wallichii is too similar to the E. stellata than the R. rotundifolia. R. wallichii would throw things off.
The right side. Hmmm...
I think the scale is off. The plants on the left are smaller and finer leafed plants. The big leafed Sword and the plant behind and to the left (Watersprite?) are too big. I think those are the plants that need to be addressed.
I suppose you would want my opinion on a solution? I was hoping you wouldn't!
I don't see any hardscape there, so something like that could do the trick. A nice, smallish, stump-like piece of wood might look nice there. A curved piece of wood might be good as well. The curved wood should cradle the Sags and go from a low point to a higher point as it moves from left to right. A small variety of Anubias could also be attached to the wood. The wood would (no pun intended) transition the left side of the aquarium to the right, and the back of the aquarium to the front. You can leave the vals and the Ludwigia repens no problem.
Rocks? I personally don't think so at this point. You would need at least three rocks, and they would need to be of similar composition. The rocks would need to be arranged in an area larger than the space I feel is available.
But then again, what do I know! Every time I suggest a lay out I get shot down!
The only advice I can give you that you should take to heart would be to consider your options. Don't rip things out in haste. Your aquarium looks great! It just needs some very minor tweaking. Think, plan and then act!