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Interesting amplifier you have there Ceko (nice dac chip and a good usb input)
As per Bencat's request,which raspberry pi, which power supply and which OS are you running.
If you are only interested in spotify connect (and have the premium service) there are several distros which supply all that is necessary.
You can even build your own (doing copy and paste).
For a broader user experience, then I would second Logitech Media Server, Moode Audio or Volumio.
Where are you
Which Raspberry Pi are you using ? Why are you turning it off ? The Pi 4 current model is quick and very stable (including WiFi if your own Wifi service is stable) use Logitech Media Server and that has a specific Spotify plug in which once set up makes it simple to use . A Pi uses about the same a a 2watt bulb when left on so very low . Once set up and working it is as good as anything as the source of Spotify . If you use LMS then the addition of the Material Skin plug in GUI means you can con
If anyone near me (Melton Mowbray) wants to try some 15v LPS (or indeed 5v) with their DAC then I have a few different power supplies from the mundane to the exotic . . . . . bring your DAC over here and have a play to see what difference you can hear . . . . . . .
Incase you're not aware when matching pre and power amps impedance matching is very important the output and input impedance of the pre /power should be a good match there's lot's online about it and a quick google should tell you all you need to know.