I would suggest trying a job at the pub pulling beers. Not what you want to hear, I bet, but the best for your students who pay a considerable amount of money to YOU to teach them to fly.
Are any of your students CPLs? If so, a ground job for a while may help you to empathise with these up-and-coming professional pilots.
Or stop waiting for a better job to fall into your lap. Take your hours and go find one somewhere else. Success will solve the problem. A lack of success might improve your attitude.
I know you said you put in 110% still but if that's how you feel then I believe it will show through in attitude and performance, despite your efforts not to let it.