Don’t. The PI 5 does not bring anything new or better on the audio front.
The only reason I want to support it is because this is the new generation and as such there will become a moment that it might be better to get than the Pi 4.
Somewhat related: I do advice a Pi 4 in favour of a Pi 3 because of a (much) better USB implementation, but obviously that only counts if you have an USB DAC.
So I suggest you enjoy your Pi 4’s 
Thanks