How do I get off the treadmill of always having to fill the funnel again?

You are good enough to fill the funnel on command, and that is exactly the trap. The number resets to zero every month, and no matter how well you did in the last one, the pressure starts again. That treadmill feeling is not a flaw in you. It is the nature of a job measured by a quota that never stays filled. The treadmill will not stop, so the thing to change is your relationship to it. The work is a cycle, not a mountain you finally summit. Some peace comes from accepting that and stopping the expectation that you will ever be permanently caught up. You will not be, and that is the shape of the job, not a personal failure. Protect the parts of your life the funnel does not touch, and take real rest between the pushes rather than bracing the whole time. Also worth asking, quietly: is this the treadmill you want to be on for years more? There is no wrong answer. But a person running full speed rarely stops to ask, and you deserve to.