How do I accept the limits I can't change in my work?

Working against absolute limits teaches you something most people avoid learning. There are walls. No amount of wanting turns them into doors. Coming to accept that isn't giving up; it's seeing clearly. Acceptance gets a bad name, as if it means you stop caring. It doesn't. It means you stop wasting yourself on the impossible so you have something left for the possible. A person who knows the real limits works with more force, not less, because none of it is spilled on a wall. Start with one thing you've been fighting that will not change. Say plainly to yourself: this is fixed. Then ask what's still open around it. That's where your effort belongs now.