I heard it said that the key to great acting is honesty, and once you can fake that, you're all set
Sadly, "emotion" is the one thing that just can't be faked. If the player played to a click track, then its easy enough to take from several "takes" and make the best "comp", but in the end, I suggest concentrating on mixing to make the most of what you have, and see if maybe the vocal can "build" as the song progresses. Do critical listening to the first verse, then jump to the last(best?) and let your ears tell you what might be different.
Maybe on the last verse, the singer leaned in closer to the mic? add some lows or low-mids in the first verse to try to match the proximity effect that happens when a singer gets close to the mic.
Or maybe the singer gets "edgier" in the later parts so you might add some upper-mids on the early part. Remember that you can automate any EQ parameter, or you could insert 2 or 3 EQ plugins, set one for verse 1 and automate it to bypass the rest of the song. Next EQ plugin could be bypassed until the middle and the 3rd EQ plugin could come on for the last part.(IOW, you have a lot of possibilities available)
Or maybe listen for breaths and actually bring them up in the mix as they may give the impression of more "emotion"(it never hurt Michael Jackson
).