If by "you" you mean the totality of the universe that you are a part of, then changing "your" consciousness does change the world, but if you think of yourself

If by "you" you mean the totality of the universe that you are a part of, then changing "your" consciousness does change the world, but if you think of yourself as merely an individual subject--not a subject as substance--then nothing you do to "yourself" will lead to liberation, because others inability to find liberation creates a contradiction within your own.