Someone just yesterday was having audio issues with a system they'd upgraded to Buster from Stretch. Couple thoughts about it. Check in your users /home/.config/ a directory named pulse in there, copy that somewhere else ie: somewhere else, name it pulse.bak or whatever. Then try rebooting, seen people mention sometimes these app config directories and files could be automatically recreated if you delete them and there isn't one when you bootup. Don't know if that's the case with Debian Buster though.
Anyway, if still not working after reboot could either remove (or purge) pulseaudio, perhaps alsa-base or alsa or whichever are relevant to your system/OS and then reinstall them or just outright try reinstalling them with ... or similar.
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sudo apt-get install --reinstall pulseaudio
Of course watch the terminal output while undergoing any of the above, what's going to be removed ? Etc.
Finally could resort to what that user ended up doing to restore his sound-audio. He installed Buster completely fresh and sound starting working. Am assuming it was likely a config file conflict as noted above but yeah it did turn out apparently being an improperly done migration from Stretch to Buster that messed up the guys sound. Could get into how you actually performed the dist-upgrade too(not doing that) but unless something has majorly changed weird borkage like this is clearly why fresh installs between releases is the recommended method.