Sometimes you do have to fire people. Have you fired someone before? If not, fire 1 person, the worst performer. Then have a talk with the others. But be carefu

Sometimes you do have to fire people. Have you fired someone before? If not, fire 1 person, the worst performer. Then have a talk with the others. But be careful. Also, it looks like you hired badly. Hiring is hard, consider it a lesson and work really hard on doing better next time.