You should know what your biggest weakness is.
Not for the purpose of exposing it to anyone else or even writing about it — I’m not about to do that, at least for now — but to protect yourself from yourself.
When you know your own weaknesses you can measure your responses to things and people. See where your blind spots may be exposing you. See where your reactions are disproportionate to the circumstance. And you can compensate and cover yourself accordingly. If you don’t know what your weaknesses are, do a candid self-evaluation that is for you only. Ask yourself what you’re afraid of or what causes you anxiety, what situations knock you off-balance (or have in the past). The better you know yourself, the better you can control your own actions and responses.
Better you than your enemy.