Should I cash in?

I have an Oppo UDP205, using it as Roon endpoint and DAC, fed by a very old Mac Mini (no idea what OS, it’s too old to use Roon 2.0 though). I never use physical media any more. 
should I sell the 205 and upgrade the Mini to a more updated version, then get a DAC to replace the Oppo’s DAC? I do currently use the balanced outputs to my pre (currently an Emotiva XMC-2), then to the Pass 250.8, then Aerial 7T’s (so you experts can guide me based on level of current equipment).

My technical knowledge on digital is almost non-existent, my eyes glaze over quickly when discussing bits and clocks and formats. I know SQ is subjective, but I would like the option of Roon on the go, and my current setup won’t allow that, and the sound quality of what I have is satisfying as is. Not looking for a leap forward in that department, but any changes would have to be at least as good. 
 

I also have a BDP103, so if I did need a transport with the new equipment to load what few discs I have, I would have that.