My own deconversion was prompted by realizing that Rand sucked at psychology. Most of her ideas about how humans should think and behave fail repeatedly and embarrassingly as you try to apply it to your life and the lives of those around you. In this way, the disease gradually cures itself, and you eventually feel like a fool.

It might also help to find a more powerful thing to call yourself, such as Empiricist. Seize onto the impulse that it is not virtuous to adhere to any dogma for its own sake. If part of Objectivism makes sense, and seems to work, great. Otherwise, hold nothing holy.