If you’re using WiiM internal DAC, without a doubt you would notice the difference by upgrading. Now the question is what upgrade would bring the most ROI. I’d say start with a DAC. In that system something along the lines of Chord Qutest would be a step in the right direction. I tried WiiM Pro and the internal DAC is just not that great. You can get a decent streamer/DAC combo as well (i.e. Lumin or Auralic on the lower end of the price spectrum). I prefer separates for more flexibility and better upgrade path.
Importance of streamer in audio chain
I have a wiim pro with a Deshelli dac 4399 chip and sparks op amps. Would I notice a difference by upgrading my streamer? My other equipment is a Rogue cm2 and Falcon Q7 speakers.