We must learn our limits. We are all something, but none of us are everything.

Accepting a boundary is not the same as accepting defeat. You are genuinely good at some things and genuinely not at others, and the second list is not a personal failing to be corrected by effort. Trying to be everything spreads a person so thin that the something they actually are never gets developed. Knowing where you end is what makes collaboration possible, since you can then say plainly what you need from someone else.

Name one area where you have been pretending to be competent. Hand it to somebody who is, or learn it properly on purpose, but stop paying the cost of the pretence.