I know the feeling well, and if you feel like that then the best thing to do is get off hifi forums and go play music.
As forums like this always make you think whats next.
Also keep away from audio store’s as you will always feel like you are missing out if you go listening to better gear.
Only problems I’m having is time, like all (or most) of us there’s lots of others things that require your attention. Makes the time I do spend sitting down listen more important and ultimately more enjoyable.
Solution: only one system in the house! (And selling the second would give funds to further upgrade first, or for something else.) Unless you mean in another place you live, when sadly for your wallet your solution is upgrading…
I found retirement didn’t solve the listening time problem - or hasn’t yet, as a son bought a house needing serious refurbishment, and the planned campervan touring started to happen - less listening time than ever before!
There will always be two systems in the house! I listen to a lot of internet radio and local NAS content whilst working (between meetings). Never been one to sit in a silent room.
We’re pretty much done with upgrading the lounge system, bar two interconnects and maybe a punt on replacing nDAC with NDS.
Office system is SuperUniti into Monitor Audio Monitor floorstanders (late 90s vintage). When we had 272/250DR the gap wasn’t big enough to bother me, but now I find the office system sadly lacking in detail.
When we got nDAC we tried it into SU and it was a big uplift. Another nDAC or ND5XS2 might help, or maybe a Nova.
Get a separate listening room separated with a layer of insulation, concrete, screed, floor tiles and that should do the the trick. With the stereo downstairs playing Bach organ music at 12 o clock, and standing upstairs with the wife, asking is that ok? If she replies I can’t hear anything then you know all is well