#1 What do you not like about the sound coming out of this stuff? Or what would you like changed, hear more of/less of? If you don’t have a clear answer in your mind to such questions, the word "upgrade" doesn’t mean much. It could also easily turn into a "upgrade", "sidegrade" or "downgrade" into a type of sound you don’t like. Spending more and more above a certain price bracket is no guarantee of anything.
For example, if the soundstage is a bit too 2D, not 3D enough for your tastes, the Mac could be a culprit, has some 2D flattening/flat wall making tendencies....If the sound is a bit too soft, not a whole lotta detail, just generally unexciting or too much sleepy time/yawning resulting from sound, it could be the Faber (for you, that is...your personal taste o’ meter)....Some other guy’s taste o’ meter may be somewhere else and your gear may be perfectly fine for him, it could be "organic" and "musical" for him.
#2 No mention of any treatment on your comment, so, I would say that if all this stuff is just plopped down in a room with no treatment, an upgrade doesn’t mean much either. Scroll over to about 3:30 on this youtube video. It should provide a tad amount of insight about spending cash in the right places.
i only listen to music in 2 channel, but current system:
Dedicated 20amp line
AQ Niagara Edison outlet
AQ Dragon power cords and interconnects throughout
AQ Thunderbird Biwire speaker cables for Front LR
AQ Thunderbird Zero speaker cable for Center Channel
AQ Vodka Ethernet cable
AQ Niagara 7000
McIntosh C2500
McIntosh MC1.2kw (X3 for LCR)
McIntosh MX160
Mcintosh MC207
McIntosh MCD205
Cambridge Audio Edge NQ
Fisher MT-6225 Turntable
PS5
Sonus Faber Olympica III
Sonus Faber Olympica I
Sonus Faber Vox
REL 212 SE (X2)