Well, there is a simple way to combat this problem i.e., sound booster. YouTube volume issue could be due to various reasons such as poor audio quality of the built-in speakers or low original video sound. Have you ever listened to a YouTube video on max volume but still the sound wasn’t audible - even after turning up the YouTube volume as well as device audio? It is super annoying and inconvenient when you increase volume to max yet the video remains inaudible.