What to upgrade on $3,000 budget

When improving my interconnects to Audioquest Diamondbacks, my system became too harsh. It's JM Labs Daline 3.1, Jolida 5t preamp with factory mod, Adcom GFA 545 II amp, Moon 100 D Dac and Airport Express. I'm using Audioquest CV-8 speaker cable. Should I consider upgrading the amp or speakers and with what? I listen to jazz, classical and vocals. I'd be grateful for any advice. Thanks.