Going back to the question of soundtracks, the two main objections I have regarding audio on so many YT videos is wind noise and totally inappropriate music at too high a level.
So many have wind noise which triggers the automatic gain control lowering the volume of the sound you want to hear to an inaudible level.
Choosing music is something you have to think about. These are some of the criteria I apply.
1. Does it fit the mood and content of the visuals?
2. Does its tempo fit the rhythm of the edit, and if it has one, the pacing of the voice over?
3. Is the instrumentation in keeping with the time period of what is in the visuals?
4. Does a sequence need music in the first place?
5. Do I actually like the piece of music?
I can say that in the decades that I have been scoring using Production music, I've not had a single complaint as to the choices I've made.