My serious answer would be proportional representation via STV, which was briefly experimented with in the Progressive Era, but seriously upset the machine Dems, who were horrified when Republicans, blacks and socialists started appearing in their turf.
I also think NJ - like many states - has far too many local executives and too small legislative bodies. If every elected local figure is just an at large plurality win, machinists can sweep every single race and crowd out opposition. Arguably it should also cut the number of municipalities to root out the numerous rotten boroughs, but I recognise that's basically impossible in most American states.
Definitely this. New Jersey has 566 municipalities, each with a council and mayor who are usually elected at-large. Plus all 21 counties have between 3 and 9 Freeholders (what we call county councilpeople). It's insane