Count me as another that who will emphasize room treatment.
Adding room treatment to my current system, delayed other upgrades for a long time, since it improved my existing system.
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.