Three things I’ve learned about listening.

4) first:  stop talking. 🙊

"3. If it sounds really good, leave it alone!"

And what if one track sounds really good, and the next one, not so much?  There is so much variability in what the media presents.

Other than using eq, I’ve set my speakers up for a range of music by including 27 different "profiles" in the crossovers available at the flip of a couple switches.  You quickly learn what profiles work best with what tracks.

OP, ..."3. If it sounds really good, leave it alone!"

That is a good one. I realize, typically I get to the point where I am really happy. After having gone through an upgrade cycle. I've done the cables, speaker adjustment, etc. Then I leave it alone... for six months or a year. So I know the sound inside and out. Then I work on speaker placement  again...or vibration control, or some aspect I have not really worked at. And I get a notable improvement. My skills for fine tuning have increased after really spending time with my system. Then I leave it for another year and then attack some other aspect. Over time... it just gets better and better. This assumes, you have gotten all your components perfect and synergistic and are happy with them.

...and sometimes one has to disconnect Everything and move it elsewhere.
Ah, well.  Time for a new space to play in, web with wires, overtax a pair of wall plugs.

Unsuspecting neighbors.

"WTF is he playing Now?"
Darkwave synth stuff...always cheery.

Starts out as a hobby, gets into ones' blood, burns your brain.
Bigger fixes until something snaps and 'I need to get out more...'  ;)

@secretguy +1