Hi Daniel,
You have a lot going for you here
The backing tracks are outstanding and the harmonies are also great. The lyrics are phenomenal; I really like them, great work
Personally I would end the song with the harmonies and not the single voice, but that may be just me.
As you indicated the lead vocal needs work. Maybe changing the melody line to something with smaller intervals may work, don’t know.
This is one you should really polish as I believe this has a lot of potential