Help my wedding please

Help I recorded a song for my wedding and I’m not happy with the sound I would like some gurus to have a peek at it see if they can make it better I’m totally new to audacity I really need some help unfortunately I recorded the voice and the guitar on the same track so they can’t be adjusted in independently I find the guitars very crisp and the voice sounds like I was in the toilet

Is re-recording an option?
I doubt it will be possible to fix your current recording because it’s already mixed.

Recording again is not an option I’ve already shot the video

Can substitute* the audio on a video,
but you’ll need to master lip-syncing …

[* not with Audacity alone, need other software too].