My volume is too loud even at 1%, what apps (that are still functional) can help with that (Moto G phone, skullcandy ear buds)

Hello. I work in a very quiet office where we are allowed to listen to music. But, as its so quiet, my earbuds are just slightly too loud to be distracting to me while I work. I have a Moto G phone, skull candy smokin buds earbuds, and I use the app Deezer (I'm not a very tech-savvy person so sorry if that is too much info haha).

I tried the precise volume control app but the feature I wanted was behind a paywall. I would like something that is free, preferably. At least free to try out, so I know it actually works before giving them my money. A lot of the old reddit threads I found from users with the same problem were 3+ years old too, and I oculdn't even find some of the apps recommended anymore.

Thank you in advance!