There are many folk here able to critique vocals so I will stay away from that.
RE: the capo and singing lower.
Imagine the scenario like this.
You have a capo at fret 12 and play exactly the chords you currently play.
You are in the identical key and will sing the exact same notes as now - but your guitar will sound higher as all notes / chords are one octave up.
Drop that capo back to fret 11 and your guitar is now in a key one semitone lower so you can sing a little lower. Drop it back to fret 10, or 9, or 8 etc. etc. and you can begin to see that each subsequent step down with the capo drops the key by a semitone each time.
The suggestion made to capo at fret 2 is directly equivalent to dropping the entire key by 10 semitones. That is a way-way-way-down deep drop of key. You would need to drop your voice a massive amount. Given that the key as it is now is nearly a good key for you such a massive drop would be, I believe, too extreme. So, more realistic would be a drop of perhaps two semitones. The same as having a capo at fret 10. But that makes the chords impossible to play right? So, what you would need to figure is, with a capo at fret 10, what do the chord shapes actually become as named chords? Then you can try to figure if you can play those chords using open chords shapes without a capo or different chord shapes but with the capo in a reasonable mid-neck position.