Start with Upgrade to DAC?

You have gotten some good advice, I’d take pieces of the different approaches.  I would switch to Qobuz or Tidal, easy, inexpensive change.  After that, I’d research DAC’s that fit your soundl signature along with trying some DYI, tests on treating your room, not talking about spending a lot of $$, research a bit, then experiment a bit with blankets, pillows, throw rugs based on what your research tells you.  Then, once you have a new DAC, you’ve tried to room treat a bit with household items you already have and have one of the best streaming services you can evaluate how things sound.  I’d then potentially look at another streamer.  Room Treatment will have the biggest influence on sound, followed by your DAC and then your streamer, assuming your streamer is functioning as it should.  
 

Good Luck! 

Thanks to all for the advice.  I think will sign up for one of the streaming services, whichever is easiest to use, and then look at DACs.  I guess I am talking mid-fi here, because about $1500 for a streamer with an LPS and $2500 for the DAC will leave sufficient funds for some room treatments.  Our room is pretty “soft” with carpet, Window Quilts (TM), and several leather chairs.

For Mesch, CDs play a big role for, although based on my use of playlists in Apple Music I can see streaming could rival CDs.

For get2the2nd:  I just upgraded my speakers two years ago, and I am VERY pleased with the Fynes, altho’ I wish I had gotten the F-704s, but they are a bit big for our room.  But the SQ is, to my old ears, superb, especially since I added the Odyssey amplifiers.

For Viridian: Cable from NAD CD Player to Bifrost 2/64 is AudioQuest Carbon optical.

again, thanks to all for your comments.

have you addressed your room acoustic yet?

That's where I would start, many people ignore the room when that's the biggest upgrade you can do bar none. like may will say the source first but if the room is not great sounding no source will sound good regardless. I'm past wasting big  money on upgrades in a room that's not optimized first. Obviously there is considerations here for multi use rooms, but I would never again spend big money on gear before I sort the room out first. learned this the hard way......

Then others have made good suggestions on upgrades after you do the room.  

I’m the least qualified person here to be providing advice but I wanted to recommend you consider a R2R Ladder DAC over a chip based DAC. 
I’m going to order a Denafrips Dac. They have 5 or 6 at various price points. I’m buying one of the least expensive ones, it’s going to be my first stand alone DAC. 

see recent thread

IMHO, you will not hear a difference in sound from a $1500 streamer vs. what you already have (or even vs. a $6500 streamer).  Think about what a streamer is: a relatively low-powered computer that moves data packets from a source to a DAC, performing no conversions or changes to the data stream.  Differences among streamers are limited to jitter and other types of noise, which can be measured relatively easily.  Streamers are a mature product now, having been around for over 25 years.  So well-engineered streamers that cost less than $1000 have jitter and other noise measurements that are virtually identical to products that cost over $30k!

But there are some here that, contrary to science, measurements, and the listening experience of others like me, believe spending $5k, $10k, or even more(!) can be justified.  Now to be clear, they cite their own listening experiences which they believe perhap even more than I believe in my own.  So good luck as you figure this out.  My advice is to with your instinct and focus on your DAC.