Oh, I've never messed with Bixby Routines, I think that might work if I need to try it!
But So far upon connecting to my car the volume goes back to 100% like I had it so maybe it already does it on its own and I was looking for a feature that I don't need with Poweramp (I was just trying to set everything up like Rocket Player when it used to be good)
Thanks for the suggestions! This app is awesome, I love that it can get the album art hi res easily and fast