How to improve live rock music performance that's so-so audio

Years ago I recorded the group I managed using a DSLR with an attached on-camera mic. The sound is okay. I've played around with different FCP settings but somehow it's just not as good as I'd like it. Then again, maybe what I recorded is as good as it can be. I tried Adobe's AI but it's strictly for podcasts. Is there anything you can suggest I try?

Thank you