Caleb should put as many promising ideas to test and encourage creativity among his employ.
Encourage is defined as to give someone hope, confidence or support.
Once we understand what the issue is, an important part of encouraging someone is to validate their feelings, and try to understand why they feel that way. I personally find that one of the least effective ways to encourage someone is to just say something like 'it'll be fine' or 'don't worry, you'll be great'.
Learn more about encourage creativity here: