OK - Now What…?

You can keep buying more sh*t just for the sake of buying more sh*t, or you can start exploring artists that you enjoy listening to, taking a deep dive into their musical repertoire, find out who their influences are and look into other artists who also fit your genre preferences.  Then come back and see me in five or ten years.

OK

Compare Streaming Services
Stock-up on some good wine
Explore New Music
Fool around with $3000 speaker cables 
Move the entire system into a larger room
Re-introduction to vinyl

Mostly what I’m hearing is to sit back and enjoy what I have…which is very sage advice indeed.

thank you all..!

I would invest in better cables - Power, speaker and interconnects
 - the Triode Wire Connectors are not doing justice to the Diablo and the rest of the rig

Take a look at Inakustik

Just my opinion - Steve

You can get much better resolution for Sure 
with much better audio cables Wireworld 8 Platinum are night and day better that I can assure you if you truly want to get the most 
out of it ,call Galen Carol audio ,hegices good deal if you buy 
interconnects, and speaker cables together . With a system 
of that quality your cables are your biggest weak link 
and if your streamer has a dac  output ,a external dac outut , in the $5k-6k range Denafrips Terminator+, Holo springs May KTE
or Audio Gd  R7 HE MK2 ,with external 10 MHz master clock all 
range all are substantially better on every level then the Aurender 
in absolute terms . A great streamer ,Melco N10,then  great dac 
your system then would be on another level still ,having heard these all in depth including the Aurender A10 .  My brother has the Gryphon Diablo300 great integrated amp he has the Great DCS Rossini dac which is the best I have heard under $50 k.. Having 40:years in audio and having owned a Audio store  has given me many listening venues to compare gear with other Audiophile clubs.

If you are "absolutely thrilled with the sound of this system", there is only one question you need to answer.  Will the tiny improvement in sound, that buying new equipment MIGHT give you, be completely drowned out by the sound of your money flying out the window????   I have personally dolled out thousands of dollars on the promise that I would hear the difference, only to end up with yet another upgrade to my system, but no discernable improvement to the sound.