The practice is to turn inward towards the source, the looker, and look for it.
Ultimately you will understand (see, experience, apprehend, discover, know) that there is no looking inside or outside. There is just one consciousness. The intentional effort of looking within was to counterbalance a lifelong habit of looking outwards and to develop introspective discrimination to eliminate internal and external objects and phenomena as the true you.
I want to emphasize that the phrase “look inward” is a lie. There is no inward or outward. This distinction only lasts while you think you are a body. The phrase “look inward” almost sounds like a command to look into the inner emptiness of imagination, as inside the body. It is a bad instruction. It reinforces the idea of the reality of inner and outer, inside the skin and outside.
The world, your inner state, your searching, your imagination about what self-realization is like, will all disappear and you will understand that everything you have experienced until that moment is imagination. You will be free of all concept and imagination. In this you must abide for a long while, but self-abidance itself does not become continuous for a long time. It is a matter of persistence alone, and that only arises after a sustaining passion for truth becomes the most important issue to you.
Then, at some point, “everything” will disappear as unreal and you will be left in silent mind existence.
— Ed Muzika – Autobiography of a Jnani (p.161-162)