+1 @knotscott I would spend some effort treating the room. You have very nice components. Room treatment is likely the best bang for the buck. A pair of subs would be interesting as well.
Weak link
Overall, I am happy with my system. Have a minor case of upgradeitis. Wondering where you would upgrade. Speakers KEF reference 3 non meta. Continuum 8 amplifier. T+A dac 8dsd dac/preamp. Innuos pulsar streamer. Wireworld interconnects and speaker wires not sure of model. Room is non treated 15x18. There is carpeting and window treatments.