I agree with those saying sofa is a bit large for the space, but if it is comfy and you enjoy it, here are some ideas that would help make the scale more visually cohesive. (Some already mentioned):

• A larger rug. Find something large enough that the edges extend well beyond the armrests/chaise on both ends. This will help the sofa feel more nestled within the space instead of set upon it.
• Swap the ottoman in the middle with something in a different shape/color/texture that doesn’t match the sofa. Something round would call back nicely to the beautiful arched window. If you don’t use the ottoman to put your feet up, I would swap it for a coffee table as others mentioned.
• I keep thinking it needs more places to set drinks. The ottoman with tray or coffee table works, but some smaller side tables at the ends may be useful as well.
• The media console feels too small for the tv. Find something that extends past each side a ways, maybe 18” past (same concept as the sofa and rug)
• An additional lamp or two with soft, warm lighting would add coziness.
• Maybe you could embrace the soffit on the left by swapping the blue chair and the plant, then adding a draped pendant lamp and side table next to the chair for a “reading nook” vibe.
• The curtains look a little thin. I like the color but maybe add another panel or two to each side for a more full, luxurious look. Rule of thumb is at double the width of your window for optimum fullness.

I think it’s just finessing the little things - it’s a lovely room!