Should I upgrade from a Mac Mini to a dedicated server or should I upgrade my dac?

Thanks Kray.
This was my thought when I moved away from USB and went to Ethernet (ie all Ethernet connections from router to switch and then to Mac Mini on the one hand, to the dac on the other).
I was surprised when several other audiophiles mentioned that the Mac Mini would continue to be detrimental compared to a dedicated server- basically suggesting that there would still be a high level noise or digital hash being passed on by the Mac. 

Admittedly this stuff is well beyond my competence and I am trying to assess if indeed a Mac vs dac upgrade path makes sense.

And I should have added to my original post that compared to my analog set up I always have a sense that my system has a certain digital "homogenous" sound, if that makes any sense,  This is something that bothers me about it and it doesn't sound right.  I have heard called digital glaze and other such descriptions and to my ears its there,  I am no way trying to suggest that one source is necessarily better than the other but with my current set-up I think there is room for improvement- but how?

@mofojo: I agree that trying all possible combinations is simply too time consuming but I certainly will continue to use Tidal/Qobuz. through Roon....hence my question of what is the most reasonable upgrade path.

@jjss49: I am sure that everything ultimately matters to some degree but I like to move incrementally and see how the system evolves.  And since there seem to be various approaches I am just trying to get a sense from others who have more experience and expertise than I do on where they think is the best place to start.


@sns: thanks for the tip but yes this may be a little more DIYing than I would feel comfortable tackling.  And just to clarify the system is set up as follows
Router -> Switch (2 outputs) -> (1) Mac Mini
                                              -> (2) Dac (newtork/endpoint)
All these are ethernet connection- switch has separate LPS.

@yyzsantabarbara: this sounds like an option and I'll look at the white paper.  The move to optical would cost some $2-2,5k so this would open the upgrade choices to three- either mac mini or dac or optical stream ...sounds like your last option would be a better choice than changing the mac mini- would go that route also if the choice were between this and getting a better dac?

@audphile1: this is what I always thought but then several times others told me that I would get a bigger improvement by switching out the mac.  Even verdantaudio brought this up on his very extensive dac resting post when I queried him on some of the dacs he was discussing- and as a dealer I thought I should take heed because from that perspective he, or any other dealer would probably stand to gain more if there were to sell a high end dac,  I have to say I have always found his input invaluable,  In any event I was looking to get some more feedback,

And btw thanks for all the inputs thus far- all very helpful !! 

I can't thank all of you enough for this great advice. 
This is great!
Based on everything you mentioned right now I am leaning towards my initial impulse of starting with a better dac and implementing the other upgrades over time,

I like the idea of integration but only to a point- as appealing as a single box solution may be I'd rather retain the ability to upgrade single components .  That said, I would probably opt for a dac with a bridge/network Roon endpoint- I was thinking of a Bricasti M3 or maybe an M1 SE (really stretching budget here); another audiophile I know well swears by the Manhattan II.  I believe any of these these should be a good step-up from the Moon 280D (though it remains a very competent dac).
The other option of course is a dac without any network card (maybe Aqua La Scala or Holo May) and investing in a separate Roon endpoint- Sonore etc as discussed above.  In other words, spending less on the dac itself and to give more room to an endpoint upgrade. At this stage I'd probably leave the Mac Mini for last in the upgrade process.

In all of this I should mention what I am looking for; first and foremost I would like to eliminate that electronic hash that bothers me, and second I'd focus on a believable soundstage.  Many often refer to soundstage width as an essential element but given the choice I tend to care more about depth,.  And as I have experienced with analog when properly set-up, that sense of space goes hand in hand with "forgetting" about the speakers and all the equipment upstream.  For this I can also forfeit some microdynamics for a better sense of the overall musical event (I sound like an analog person! but don't want to go overboard either as I do care about transparency, detail...and dynamics).

Thank you!
And if you have any thoughts on the dacs I mentioned or any others that I should consider please let me know.  I am trying to keep myself to a limited budget ($5k-$6k at the very max - preferably $4k or thereabouts) so I will probably look at a preowned dac.
I already mentioned that my priority is a believable soundstage- the other aspect I need to consider is brightness- both the Thiels and Omega Duo horns can become a little hot in the treble if not carefully matched with appropriate electronics upstream.  This is something I will need to look out for.