1. Be brutally honest. Is the problem something specific about your job, or is it the job itself?
2. Change your routines. Sit at another desk or try somewhere new for lunch.
3. Find positive people and talk to them. Their attitude will rub off.
4. Take some risks. Suggest ideas even if you're worried they'll get ridiculed.
5. Visualise where you want to be in a year's time. Set realistic goals to get there.