OP, your speakers and amp are way above average. If you're going to get in the world of streaming, IMO your streamer should be on equal footing with the rest of your components. My suggestion is to look for something like Innuos Zenith MK3 or Aurender N100. Yes they are expensive, but with a system like yours you will absolutely appreciate what they bring to the table.
Another benefit of these particular streamers is that they provide a way to store music locally via the built-in hard-drives (SSD). In essence, they act not only as a streamer but also a music server. Why is that important? Well, first you can rip your CDs and play them via the streamer (or music server to be more precise). Second, there is a ton of high resolution music that you can purchase from many online stores. These units will make it easy to organize all kinds of music. IMO, a lot of high-res music (e.g. 192/24 or DSD) sounds better when played via local storage vs. streaming from services like Qobuz, albeit, they are surely closing the performance gap.
Lastly, please ditch Spotify. Go with Qobuz or Tidal, and enjoy the music!