1. Students are going to take their queue from you. How you react is how they are going to react.
2. Do an honest evaluation. "Poor me, I'm not a good teacher" is not a good evaluation. What did we do right? What do we do wrong? What did I do right? Where are areas of personal improvement ?
3. Rewrite or write a clear vision statement for yourself for the rest of the year.
4. Change the culture to:
a. Embrace challenges
b. Persistence in the face of setbacks
c. recognize that effort is the path to mastery (Talent may be different, effort is the same)
d. Learn from criticism. (This in my opinion is the hardest because criticism is delivered in a variety of methods)
e. Find lessons in the the success of others. I know way too many band directors who are bitter and jealous of the success of others. What did they do right? What can we learn from their challenges?
This is all a reminder for me as I personally move forward. I hope this helps.