Looking for a true upgrade in sound quality

I currently stream Qobuz and Tidal through my Lumin T2. I have had this about 4 years. I have AT&T fiber optic internet to the house the ethernet cable direct to the Lumin. About 30' of cable from the router to the device. I was thinking of using the Lumin only as a streamer and adding a conceivably better DAC. Is this a legit way to go about a more resolving sound. To my ears there is a slight veil over everything and maybe a little etched overall, bass response is great. I was also hoping for a recommendation for the DAC if this is a good option. $6,000 budget new or used is fine. I have had very good luck with used equipment over the years. Thanks, Allen.