Didn't work. I created the file, put it in the right place with the right name (the way you told me), enabled it via systemctl but after a reboot I still have to execute the command I found on TJC to get the volume higher.
[Unit] Description=Fix volume settings After=pulseaudio.service Requires=pulseaudio.service [Service] Type=oneshot RemainAfterExit=no ExecStart=/usr/bin/pactl set-sink-volume 1 200% [Install] WantedBy=default.target