You are running well under your own limit.
The Exponential Individuals Playbook argues that most people operate far below what they are actually capable of, and that the gap closes through what the authors call mighty effort. Take the size of the multiplier as their claim, not a measured fact. The direction is what matters: the ceiling you bump against most days is one you set, not one the world set for you.
The perceived limit feels like a wall. It is usually a wall you painted. You decide this is the most calls you can make, the most words you can write, the most risk you can stand — and then you stop there, every time, and call the number "my capacity." It was a habit wearing a fact's clothes.
The way past it is not heroics. It is a test. You push one notch past where you always quit and watch what actually happens. Usually the catastrophe you braced for does not arrive. The wall moves. And now you have a new, slightly higher number that feels permanent until you test it again.
So find the place you reliably stop and treat it as a hypothesis, not a fact. Push one notch. Measure what breaks.
Most of the time, nothing does.