You’ll need to post pictures of the room for advice

oop so sorry here it is

I’d recommend cobalt chairs with a shape that complements couch and add lumbar cushions, pulling in a lot of your room’s colors.

I like the chairs you have I love cobalt blue but too much i IMO too much. Maybe a nice neutral color and lumbar pillows with a bit of the cobalt in a print and why the purple pillows on the sofa ?

Maybe take colors from the artwork? Soft moss green chairs, coral and amber accents? (Can't really illustrate those because of the photo's lighting.) I substituted a dark wood console for the gray one. Are there lamps in the room somewhere?

You are showing gray club chairs in the photo--are you replacing them or adding more chairs? If adding, where are you going to place them?

I am thinking about replacing the gray chairs

the purple pillows bring in the color of the backspash of the kitchen on the other side of the open space concept.

You could go bold--fuschia like the pillows, green as simplynatural showed, coral/orange. Everything else is very neutral, so going bold would really make a statement!