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Are you using WirePlumber or pipewire-media-session? WirePlumber seems to remember my volume settings, but that also might be a DE thing possibly.

I use WirePlumber (the systemd user service is started), and no DE (only a WM).

Wireplumber stores volume settings in ~/.local/state/wireplumber/. It is not a DE thing. I use i3. I have a separate mic and it remembers the volume.