Good.
Every channel that you see marked MM is currently muted.
So starting from the Headphone channel on left unmute by typing "M" (without the quotes"
I suggest you unmute all channels marked MM as experiment.
You can save your alsamixer settings using the terminal command:
sudo alsactl store
PS: I hope your problem with sof-bytcht is easier to fix than this one:
EDIT: I have also done a websearch using "sof-bytcht rt5645 Ubuntu 20.04"
Results include ref to alsa changes v1.2.2. v1.2.3. @Aravisian may be able to understand it better than me.
https://www.alsa-project.org/wiki/Detailed_changes_v1.2.2_v1.2.3