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Using --audio-filter=volume,volume (not allowed natively) would require forking VLC source.

Instead of dragging the slider to 400%, you can apply permanent gain to a file:

What if you want to burn that 400% volume boost into the video file itself? For example, you have a quiet MP4 that you want to put on your phone, but your phone's video player doesn't have a 400% option.

VLC can convert the file with a permanent volume boost.

The conversion guide:

VLC will create a new video file that is permanently 400% louder. When you play it on any device (iPhone, TV, car stereo), 100% volume on that device will now sound like 400% did in VLC. Warning: This file will clip if played on high-end systems.