I wouldn't change anything to add to his character as much as I would change to take away from the character and I think it could benefit.
Personally, I love the current Zack Ryder gimmick, but lets face it, it's not getting him anywhere and he isn't even being taken seriously. But first off, I would take away from his attire. Get rid of the headband, the see-thru jacket, entrance attire thing, and the sunglasses, and also changing up his logo a bit on his trunks. I feel that the headband, and entrance attire takes away from him being taken seriously, sure it adds a unique part to his character, but it isn't helping him. Just minor changes like this will help him grow as a superstar, maybe not by much, but maybe a little. And if he needs entrance attire, maybe a leather jacket to the ring or something would work.
I would also take away his catch phrase. Let's also face it, Woo Woo Woo You Know It, just won't work for someone trying to get a push. I would keep him from catch phrases until he has time to develop a nice, cool, serious one. I personally love the catch phrase, but if he wants to make it, he needs it to be dropped.
I would also change his theme music. I love his song, as much as I just love everything else about the guy, but even if he had some generic music going on, he would be taken a bit more serious, which is what he needs.
I would take away his nicknames, like the "Long Island Iced Z." Once again, these nicknames won't help in building him as a superstar, I don't think he needs any nicknames at the start of this gimmick change if it were to happen.
That's about all I would change for him. Yes, this may make him seem like every other generic wrestler, but, it will work for him, because this guido character just isn't helping him. And this would be like a silent gimmick change, where his attitude doesn't change much, where he can still be a cocky, arrogant heel, who thinks he is a ladies man. Or, he could just get a more vicious, serious, hungry young performer. Either way, I think it would do him good.