45+ years of this hobby for me. In recent years, I've upgraded everything. Spent the last several months tweaking with cables. With the possible exception of an upgraded dac, I think I'm done.
Tweaking with cables has been interesting. I have a new digital coax cable on the way to me. My cd player into my dac isn't quite as good as streaming. Thought I'd try a better cable, but it may also be that the streamer is using an I2S input.