audiophiles who are just getting the itch to upgrade

Hello, I am reaching out to the community of those audiophiles who are looking at this unprecedented time in our history to upgrade their components. Why? because we are now spending so much more time with our gear and looking for ways to improve it, because we can :-) My questions is this; if there was one component you could upgrade in my system, what would it be and why?
  • Linn Sonedek  LP 12 with Hercules board, Ittok II tonearm and Koetsu Black Cartridge
  •  Fritz Carbon 7 SE Speakers -
  • Audio Mirror Tubadour III NOS DAC with   Miflex KPUC caps(courtesy of Don Sachs) and the Z foil resistors
  • Cary Audio SL80- Signature 1 with VH audio Reference V-Cap CuTF output caps plus Cary volume IR upgrade and mains cap upgrades. Running Gold Lions KT88 matched tubes, Shuguang Treasure CV181Z - 6SN7 Pre-Driver/Phase Inverter tubes,  Sovtek NOS 6922 Input Buffer Preamp tubes and  WINGED "C" (SED) 5U4-G GREY PLATE tube
  • Manley Labs Chinook phono pre-amp
  • Cullen crossover series speaker cables and power cords
Well that's it and I know that are a lot of you in this community who have far more experience with matching systems and upgrades than I do. Thank you for your assistance and happy listening ! 
E143e686 5802 4b4e a4e1 3a0791a743a4phill55
If that really is your "system" then boy do I have the upgrades for you!

In no particular order:
Synergistic HFT, ECT, PHT, Orange Fuses, Orange outlets
Cable Elevators
BDR Cones

And then there’s the really good stuff. But for that you have to PM and as Riddick would say ask me all sweet-like.

This btw is what your Koetsu will look like when you do: Look real close.

Agree with Masi...upgrade the bearing and power supply to the Linn. I personally would not switch over to VPI- they just don't boogie like a LP12,imo. Source first!
What the heck change it all:)
It sure does make it easy to vacuum!
Ok. So in order; I do have definitive tech supercube 2000 with paradigm x30 high filter subwoofer control unit. Fits the bill. Love to consider GIK room treatment but system is in living room (wife doesn't want me living in my office / man cave) so that option is a resounding no. Agree Fritz speakers are a winner! But don't take my word for it ask Fritz...he is the real deal passionate about his craft and will lend you speakers for 30 days no strings attached. Masi, thanks for the insights on Linn upgrades. Millercarbon, can't compete with you on your journey. Thank you everyone. Anymore input always appreciate...Enjoy the WFH new normal in this new world.