If your incubator is in a room with a steady temperature, you can try just removing the hatched chicks after they're dried and fluffy and putting them in a brooder under a light. I ended up doing that since my hatch was spread out for five days. It was supposed to be only two days - but some hatched early and some hatched late. I just got the brooder ready and opened the incubator just enough to reach in quickly to remove the hatched chicks. The temperature never wavered more than one degree and the humidity stayed high.
If you don't have another incubator to use as the hatcher, that's about all you can do. But it worked okay for me. Good luck!