The task you avoided may need a clearer beginning rather than a harsher voice.

Avoidance is usually a design problem wearing the costume of a character problem. When something sits undone for weeks, the natural conclusion is that you are lazy, and the natural remedy is to be tougher with yourself, which mostly adds dread to a task that already had enough. Look closely and the real obstacle is often that the first step is undefined: you do not know what opening the thing would actually involve.

Take the item that has been on your list longest and write down its literal first action. Make it small enough to be boring. Then do that one piece and let the rest stay undecided.