Streaming through upconverting DAC - can I even improve audio quality?

New to streaming but have been at this hobby for over 50 years.  Started by getting a Marantz SA-10 SACD player that enables streaming through its DAC only via SPIDF.  The SA-10 upconverts everything to DSD 11.2.  So I started with ifi Zen Stream via ethernet, good Belden 75 ohm cable, then upgraded streamer to ifi's linear power supply, which made an improvement I could hear through balance of system, Luxman 590axii and Yamaha NS-5000 loudspeakers.  Sounds good so I'v e started to look at other streamers thinking it could get better, including the new Eversolo DMP-A8 (where I could use its DAC or the Marantz) and even the $5200 HIfi Rose RS-130 (streamer only).  But here's the thing:  so far, just using free Spotify 44.1 redbook quality, 1) since the Marantz upconverts everything to DSD 11.2 would I gain anything from a premium streaming subscription? and 2) the Ifi's femto clock and it's purifier noise removal works on the signals into the unit (clock) and then out (purifier on coax) and then the Marantz' dual clocks take over, so is there anything to be gained with a different streamer's clock? Or have I gotten the quality to about as good as its going to get without investing significantly more in another higher end DAC and streamer?  Should I be able to get SACD quality via streaming or maybe I'm getting that now and it's just that streaming sounds different than a SACD.