Hey I have another idea for your low volume issue. How about trying easyeffects? Please note the following if you are going to use easyeffects.
- You need to install all it’s optional dependencies as well since without them you won’t be able to apply any effects at all. They are needed. More on them on this post below
- There are times when waking up from sleep leaves me with no sound on my machine. This didn’t happen before using
easyeffects. And changing TTY doesn’t do anything at these times. Though the resolution for that is pretty simple.
2.1 Restart your pipewire sound server.
systemctl restart --user pipewire-pulse.socket pipewire.socket wireplumber.service
2.2 kill the running easyeffects sink, since it needs restarting too.
kill -SIGKILL $(pgrep easyeffects)
2.3 restart easyeffects
setsid easyeffects --gapplication-service&
With that out of the way here is my easyeffects config to help you out. Now beware that I am no sound expert and these settings might not be optimal but hey they work for my laptop and increase audio’s loundness for me so goodluck. 
These are the values that currently work for me, please don’t ask how I just got hit and trial and they seemed to work. You might have to do the same.