Is Jesus Christ Only A Mediator Of Small Sins?

If I fall again, will He be there to pick me up? Can we find hope in the wake of committing the deepest and darkest sins of our lives? After the affair. After the adultery. After the murder. After the deception. When we are most disillusioned about our own salvation because of our depravity, this is when the doctrine of the atonement and mediation shine brightest.