Sorry, nimble fingers hit send by mistake.
The psychology of becoming dissatisfied has many causes including, without limitation, reward processing (constantly seeking reward pleasure), hedonic adaptation (diminishing joy over time), consumerism (market psychology - there is always something better you should want; FOMO), and Diderot effect (since one item is new I need another new item). Goal setting can help. As a music lover, establish your ideal of how acoustic live music should sound. Evaluate your system against your ideal, determining where you want to improve. Audition alternatives and only change when your goal is reached. I have used this approach and have been satisfied long term, not changing often.
I love the sound of my system. The only time I become dissatisfied is a few days after I attend live acoustic music performances. The dynamic bloom, the way the imaging and staging develops, and the liquidity and sweetness of the instruments in a large hall makes me think we are far from this ideal. My system is close on well engineered recordings, but not there. Then after a few days, I am back to reveling in musical composition and performance as reproduced by my system