A quick way to start with streaming is to get a RaspberryPi based solution (RPi). You can build one yourself if you like to tinker, it is not very hard, or by a ready-made product. I built my own by adding a HifiBerry Digi+ to a RPi and placing it all in a box and then connecting it to my normal dac through s/pdif.
If you don't want to tinker you can by one already assembled like the Volumio Primo or Orchard. You might need to subscribe to MyVolumio to get Tidal och Qobuz.
I think streamers are still evolving and they contain a lot of software which makes it harder to keep them going for years to come. If the company that built it is out of business you might not get any updates and it might stop working. For these reasons I would probably limit my spending on streamers for now and wait a few years.
https://volumio.org/product/volumio-primo/
https://orchardaudio.com/pecanpi-streamer
https://darko.audio/2020/01/raspberry-pi-audio-streaming-101/