Warblers are the big draw in Fall, but the challenges with photographing warblers are that they are small, very fast and flitting, and tend to stay hidden in the brush, making clear photos very hard to obtain. They're also in drab autumn plumage, and are very tricky to differentiate. Getting good photos of warblers is like trying to catch a housefly with chopsticks.
That all said, I'm lucky enough that I have this kind of spare time to devote to bird photography. Of course, it means boring the nuts off people with endless photos of birds eating bugs and fish. The real money's in photos of naked people and misery. I can't get much of the former and feel that photographing the latter for money is exploitative, so birds it is.