People are always ragging on Harry for not getting promoted, he never gets any credit for his 7 years of humble servitude. Someone has to be the ensign and unless Janeway goes on a demoting spree then there going to be no new ones made.
And really what does it matter. So she promotes him, it's not like his day to day job is going to change. It's just all dress ups to keep them happy and peppy and feeling like they are part of something bigger than the ship. Harry doesn't need those kind of rewards like Tom does, he understands the futility of an extra pip on top of the same old grind.