You can turn it up but I will tell you from experience, it won't let you turn it up to where you want it
When I had a 2015 Trax the volume stayed right where you left it when I bought the 16 Buick everytime the car restarts the volume resets on its own.
You can go into the radio setting to turn up the volume at start up, but it only allows you to go so high, the highest point is still too low to hear the music well.
Check your radio settings you will find it there.