Fixing tinny sound

Hello everybody

I have filmed a dance performance and by accident had the input set to mic because I did use the lapel earlier.

For the att setting I had it in 0db.

Consequently the audio I have comes from the little boom mic only rather than the camera itself. I think this is what happened anyway. I use a Sony VG30.

My sound is very tinny and I’d like to see if anything can correct this. It has a lot of African drums in the show and so I’d like to have a video that brings out the bass and richness of sound.

Thanks for your help