Simple, learn to embed your audio system in the mechanical dimension, in the electrical noise floor of your house, and in the acoustical dimension of the room...
After that most upgrade would become less tentative and often useless if your audio system parts were wisely choosen to begin with...
Upgrading is half the time a reflection of our ignorance about our actual own audio system...
My system value is 500 bucks, upgrading it will cost me too much (more than 10.000) because it is so well embedded now, and anyway i am now happy with it....
Are you able to listen to 9th Bruckner symphony and able to hears all orchestral details and instruments timbre? If yes, your audio system is well embedded and wisely choosen....
Audiophile experience may cost peanuts if you learn how to embed your system.....