If you're devoting time, energy and intention toward preparing for and creating new opportunities, it will fill soon enough. There will always be people who achieve less or more than you. Set goals that feel good to you, that you enjoy working at, and stick with them. Many self-help technologies encourage you to set higher and higher goals and achieve more. If that doesn't feel good to you, don't do it.
Eastern spirituality speaks of the power of silence.
When you come from a place of being calm, clear and centered, you'll be more focused and productive, accomplishing more in less time. It's hard to be creative when your mind is racing in a thousand directions. If you've been going at a fast pace for years, you've probably been running on adrenaline, and when you start to slow down, you may find yourself feeling bored or restless. Stay with it, rather than falling back on old patterns to relieve the discomfort for the moment. Adrenaline can be addictive, but you can get beyond the need for it.