Try using some well known brands used by audio professionals (recording, mixing, live sound engineers).
I use Mogami 2549 for balanced and Blue Jeans Cable LC-1 or Mogami 2497 for unbalanced interconnects. I use Belden 5000 series or Canare 4S11 for speaker cables.
I use Blue Jeans, Canare or Apogee Digital cables (AES, S/PDIF, and Toslink)
I use two sources: Redco and Blue Jeans Cable
https://www.bluejeanscable.com/store/speaker/index.htm
https://www.bluejeanscable.com/store/audio/index.htm
https://www.bluejeanscable.com/articles/index.htm
https://www.bluejeanscable.com/store...sign-notes.htm
Read the relevant articles on BJC's website
https://www.redco.com/Mogami-W2549.html
https://www.redco.com/Mogami-W2497.html
By audiophile standards, these are inexpensive cables but used on a daily basis by people who make the recordings you listen to and do live sound at concerts you attend.
Once you have tried basic high quality cable made by companies who specialize in making cable with data to back up their performance, you can try some more expensive cable to see if you can hear the difference and decide if it's worth it to you or not.