Without seeing the rest of the room, I wonder if you could move the seating area to the adjacent wall? Instead of having the two chairs with their backs to the window facing the room, have them back up to the wall and face the sliding doors. You'd also need to move the cabinet elsewhere.

The symmetry of the chairs unfortunately adds to the imbalance. Could cabinet be moved and 2nd chair go on that wall?

No matter how you arrange the furniture, try to offset/balance the window with art. Just a thought, wondering if the valance is emphasizing the window‘s placement and drapes might soften the boxy/off centered feel.

More pictures of the entire room would help. Also....I think the the visual weight of the dark cabinet and clock are not helping, and simply are calling more attention to it : )

Try this ?

First thing I'd do is paint the cabinet in a pale wash of blue, take the clock down. You have room to jiggle the table a bit right , and center the lamp on the window, EVEN if the table is not dead center.

Angle that cabinet across the two walls, NO to clutter on top, other than tall blue/ whites. ( no dried flowers, baskets etc ) Pull that second chair forward and angle a bit to its mate......yes, you will block a bit of display, but everyone understands what is in there.

Is the cabinet back mirrored?) Lets hope: ) The heat grate will get a visual block, but the heat will come right out - no issue. Warm air rises.

I don't love the valance, feels a bit granny, and it isn't short enough, trimmed enough or flirty enough. A natural woven shade to replace blinds? Nicer. More suggestive of garden beyond.

Or???

As above, lose the cabinet and the clock. Get a nice BIG leafy tree in a blue/white chinois pot, add natural woven shades and EXTEND a rod with curtain panels .....use op some of that wall space. A round mirror hung behind that tree will double the effect.

Either way, what you want is balance. Not symmetry perfection.

Removing the valence from the window would help. Does it hide hardware for blinds? If so, I would invest in cellular shades that can be positioned from both top-down or bottom up (or just positioned in the middle), which are framed in such a way you don't need a valance. Check out Hunte Douglas.

Then, if you don't want to make a major rearrangement of your furniture, invest in several more pieces of wall decor to join the clock on the wall (which might need to moved a bit to the left and up higher.) . I'd pick blue and yellow pllates and maybe mix in a white wall flowers or 2.

Basically I'd be creating a corner over there with a old fashioned overload of decor. I would bring the plates far down the wall, just above the chair line, and continue with decor on the other wall just over the cabinet, maybe white flowers You might already have things in the cabinet that would be fun in the arrangment. You can put up a small bracket shelf and bring up the little decor object you have on the lower shelf of your table.

These are all from Spode replacements but you can find vintage stores selling others online.

Tozai White Porcelain Garden Flower Wall Sculptures, 7-Piece Set · More Info

Remove the valance and install heavy wall-to-wall floor length drapes that open to one side...the left side. Go all out and add sheers. Concept render...drapes are the gray block...rod is black line:

Partially closed:

Open with Sheers.