New York City is a lost cause. Its almost entirely a shitlib city with 4 out of the 5 boroughs being the unironic "acktually communism and socialism aren't bad it just hasn't been done correctly before" sheltered wealthy kids who never actually lived in a communist/socialist shithole so they were going to lap up nepo Mamdani no matter what the fuck the republicans did. Plus with NYC protecting the illegal immigrants and migrants in general, its just an entirely fucked scenario that won't ever flip until it gets so bad that there is no other option.
I think New Jersey, on the other hand, genuinely has a chance to elect a Republican in office imminently, because most of the NYCers that are fed up with the shitlibs are all moving to either NJ or Florida, and the last governor election was shockingly close despite Ciattarelli having absolutely no momentum last time and going against an incumbent. Sherill is even more dogshit of a candidate than Murphy and a ton of left-leaning unions are backing Jack this time so I think its going to be an extremely close race.