Persitance pays off. While deer are creatures of habit, they are just as likely to significantly alter their behavior at the drop of a hat, especially when conditions change like weather and the rut.

Not sure what the season is like in TN but with 2 months here in TX, I've had plenty of long stretches seeing nothing or only late night trail cam pics until all of a sudden, there they are.

It doesn't mean your luck will change but it does mean that it can, in which case all you can do is be prepared. Think outside the box, try some of the techniques listed by other posters and keep the faith.