FiiO JadeAudio KA3 Headphone Amps Tiny Amplifier USB DAC High Resolution Supports 32bit/768kHz and DSD512 Headphone Outputs 3.5mm/4.4mm for Smartphones/Laptop/PC/Players

I’d suggest a FIIO FT1 closed back that comes with a balanced cable all in for $150 US. There are also many many dongle DACs that would improve the sound between your computer and your headphones. I have an old one that I really like: https://www.amazon.com/dp/B09JFLP3LS?ref=ppx_pop_mob_ap_share