I think a lot of people are afraid to put themselves in uncomfortable and unfamiliar situations because they fear failure. I know I have. If you think about anyone who has achieved anything difficult and worthwhile, they struggled, adapted and they overcame internal resistance and external obstacles. Most importantly they kept trying different things, moved forward with adapted tactics and better knowledge until they got traction. Grinding forward, over, and over and over. As Elon Musk says of Tesla, "Failure is always an option here, if you're not failing - you're not innovating enough!"
The truth is we don't grow and become wiser, more skillful, mentally tougher, or more durable in our comfort zones. We have to challenge ourselves in new situations and objectives. What is your next challenge?