To gain productivity, you must know your current capacity. "Capacity" is defined as the time allotted to work. Regardless of how much time that is, there is a finite amount of it and it's likely to stay within a certain range. If you know exactly what your time capacity is, you are more inclined to only accept new commitments if you have capacity to complete them. Knowing your true capacity at any given moment helps increase your ability to focus on completing things you've committed to.
Business is hard. Doing all the work by yourself is exhausting. And you shouldn't go it alone, even if you think you can't afford any help. The Foundry League is designed for entrepreneurs that want more business success, but don't yet know how to get it, despite their best efforts. If you own a business that is stuck in it's growth it may be time for you to reach out to get help from like-minded entrepreneurs.