looking to upgrade - identify the weakest link?

Consider buying a good turntable, with a good arm, cartridge, and lots of good vinyl.

@tuberist it is not the source only the interface he has a Blue OS Node. 

If you are digital only, that dacmagic is your bottleneck. Look at some of the Denafrips products. But I also like the suggestion to buy a ‘table.

Oz

I would upgrade the DAC. 

If a larger speaker isn't a good fit for you, I agree that upgrading your source makes most sense.

While I am an analog lover, if you don't have any records, I'd argue that it's a major investment in both hardware and software to get worthwhile sound quality. That's a whole conversation in itself. 

Both your DAC and streamer have plenty of room for improvement. DAC first if budget is an issue. If not, get a better DAC and a low powered streamer with a very good quality linear power supply. If you can add optical isolation all the better. There are about a hundred threads here on specific products and comparisons. If you have your own digital library in addition to using Qobuz, then a NAS in a separate room ethernet wired to a network switch is the way to get the most sound quality for the money. 

If software user experience and musical discovery are important to you, consider Roon as part of your plan and take the time to understand running Roon Core on a Pi/Rendu/Nucleus type device and be sure to get a Roon Ready endpoint. You can use any(or all) computer/tablet/phone as remotes. Cheers,

Spencer