Next Best Upgrade for Tidal MQA?

I’m trying to decide what my next best upgrade is going to be to improve my streaming music quality (predominantly Tidal, and Tidal MQA, when available).

Current setup:
Custom Deep Sea Sound 18” subs (2)
Marantz SR7012 AVR
Bluesound Node 2i
MyTek Liberty DAC
Parasound A21+

I’m wondering if I’ll get a bigger jump from inserting a Parasound JC2 BP as a pre-amp or replacing the DAC/Streamer with a MyTek Brooklyn Bridge? Or is there something else out there in the $2500-4000 range that will help make a significant jump?

Help and thoughts appreciated!

I heard a big difference going from Node 2i to Lumin streamer. More separation and definition in the sound. Going thru Aries DAC and 300B tube amp or Yamaha A-S2200.
Or one word: Room

You have not said much about your listening space (or, perhaps I missed it), but if you send the folks at ASC a MATT recording, they can tell you what frequencies are lacking articulation and design a solution that will dramatically improve the dynamics and resolution of your system. Chances are that the gear you already own has a lot more potential than what you are hearing.
@calieng: thanks for the feedback. I guess my real question is: is a new streamer really going to make more of a difference than a new preamp?  The wife is only going to let me do so many upgrades at a time :)

@photomax: have not tried Qobuz yet as I've bee generally very happy with Tidal (minus the lack of Metallica)

@jnehma1 @dsnyder0cnn: unfortunately, my system has to do double duty (hifi and home theater) all in an open concept shared living area.  I don't think I have much opportunity for room treatment (there is only the wall behind the speakers and a wall with heavy curtains to the side).  As for room correction, I have run Audyssey, but haven't gotten into the REW/Dirac level of detail.  I have briefly looked at MiniDSP before, how does that integrate with what I've got?