There is comfort in the knowledge that you have given something your best shot.
After all, that is what is within your control. What you do not control is how your work would be received by the world. There is freedom in detachment from the outcomes of our efforts.
And to be detached, one needs to destroy all the doubting voices inside our head and outside it. In an absolute sense, one could have always done better. However, the real world is relative, and filled with trade-offs. One’s best shot at writing a novel has to balanced with several other best shots – at staying fit, at keeping a day job, at paying the bills, at being a good friend and at being a supportive family member.
Giving one’s best shot is essentially the process of putting the serenity prayer to practice:
“God grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.”
Because giving your best shot lets you excel at what you control, while liberating you from the uncontrollable outcomes.