Without buying speakers and hoping they can be quieter. I'm using earbuds anyway.
I'd like a program with a slider/volume control from 0 to 100 or even finer like 0 to 1000.
The quietest on my laptop is still too loud for what I want before falling asleep.
I'll mention something I've tried already before it is mentioned: lowest laptop volume/lowest YouTube volume/open YouTube vid then go lowest volume on VLC. This works well but is a bit cumbersome. Would be nicer just to have a fine tune slider that controls everything.