Most people I talk to who want to move up from the PS Audio go in one of two directions if they are happy with it.
The Meitner MA3i is going to be an elevation in just about every way while maintaining the same core sound. It is DSD upsampling as well. Two steps up would be Playback Designs MPD6 and it is a debate about Playback MPD8 vs EMM DA2i as 3 steps up and which is better is a matter of taste.
Alternatively, I have people that go with Bricasti and the M1 S2 or M21 are noteworthy improvements over the DSD. This has slightly tighter bass and maybe a hair less air in the treble compare to the Meitner.
I have a lot of customers quite happy with both paths. Needless to say I am a dealer for both but there are lots of us out there and do sincerely think either could work.