I can't get the music (contained in my animated rock musical cartoon) to play back at a high volume! Why is this?

I have an ASUS ZenBook Flip 15. It has Windows 11 installed in it. I'm creating a 30-minute, musical animation cartoon.

I've tried countless "file editors," and no matter what I tried, when I played back the 30-minute animated musical cartoon videos, the (music) volume was so faint that I could barely hear it. Only Movavi video editor enabled me to play back the musical cartoon at a LOUD volume. So, I would give my business to Movavi, but they act like they either don't care, don't want business, don't want my business, are going bankrupt, or something very disappointing to me at least.

So, what did Movavi have that all the others do not have, and whatever that is, what can I use just as effectively without having to use Movavi?

Nelson J. Kane