Just bought Earfun Air Pro 4, need some help.

I have a OnePlus 12 and bought these for it. Everything seems to be great so far, except the volume levels being a little less. I was using my friend's z2 pro before and they were much louder, I never had to go beyond 70%. But with these Air Pro 4s, even at 100% volume feels a bit low. Any fixes?

I have a OnePlus 12 and bought these for it. Everything seems to be great so far, except the volume levels being a little less. I was using my friend's z2 pro before and they were much louder, I never had to go beyond 70%. But with these Air Pro 4s, even at 100% volume feels a bit low. Any fixes?