Audio Issues - Can't hear others sounds effects

Skimmed over things. Not 100% sure this is related to your issue, but it’s worth looking into.
A little over a year ago I came back after a break and had issues with spatial sound settings in Windows. If you’re on either Win10/11, then you might want to at least look this over:

Stop surround sound for Stereo - Support / Technical Support - World of Warcraft Forums (blizzard.com)