What do I do next to improve sound?

I am new to PC Audio.
I have a brand new desktop 32 GB memory, SSD drives., USB cable - basic printer cable, Essence HDACC 4K, and Audeze LCD-X headphones.
Quboz is the feed.  I do exclusively 24 bit 96k music.
Audio on PC is set for  Wasapi (Exclusive Mode)
How do I improve the sound.  Basically - how far can one go with a simple setup like this and what makes sense.
1. Software on the PC, I am regular Win 10 today?  Application or new drivers?
2. DAC with headphone amp - like Benchmark DAC3.
Thank you.
Mats