The idea of "shifting/desired reality" seems to refer to the practice of using affirmations, visualization, or positive thinking to manifest a desired outcome or change one's reality. This concept is often associated with the law of attraction or similar belief systems.
Whether shifting/desired reality is considered a sin depends on the religious or spiritual perspective one follows. Different belief systems have varying views on the use of such practices. In some religious traditions, attempting to manipulate reality or outcomes through metaphysical means may be viewed as inappropriate or even sinful, as it may be seen as attempting to control forces beyond one's human capacity.
On the other hand, in other spiritual or New Age philosophies, the idea of manifesting a desired reality through positive thinking and affirmations is embraced as a tool for personal growth and empowerment, and it is not considered sinful.
If you are concerned about the moral implications of this practice, it's essential to consult the teachings and guidance of your religious or spiritual tradition. Seek advice from spiritual leaders or teachers who can provide insights based on the specific beliefs and principles of your faith. Each religion has its own set of moral guidelines, and it's essential to align your actions and beliefs with the teachings of your chosen path.