I've done the same.... buy a new system that I like the sound of and almost immediately start thinking I can do better. I did finally make it though after realizing that the sound quality is as good as it can get for what I can afford. When these to tangents meet, that's is where you need to stop.
New equipment
Just as I was smugly listening to and very much enjoying my MUSIC, I went and bought a new piece. At first, I was so happy with the improvement it made. But then the audiophile monster came lurking. I was not listening to the music anymore. I was listening to the SYSTEM. And, of course, there’s always something that can be better.
KISS OF DEATH!
It’s taking me a while to get back to the music again. Writing this is a good step.
BEWARE of new equipment.