Lots of productivity and personal growth gurus will tell you that you need to spend time on your weaknesses so that you can turn them into strengths. What a waste of time.
If you're not great at something- unless it could lead to your demise - then outsource it.
Spend your time taking your strengths and become the best you can. In fact, take your best strength and become the best person you know at it. Actually, become the best in the world at it.
You only have so much time. The world would rather you take your passions and get great at them. It's better to be the best at something than okay at everything.