The falsetto works pretty well. The note of two leading to it suffer a bit though.
It's a good song & I'd be inclined to use a little tech support to sort that weaker notes. Sometimes ReaTune or Melodyne are my only option to save a song I can't get anyone else to sing.
Double & triple tracking are good options for strength...using an ultra short delay will help too.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe