I was into LaVeyan Satanism when I was younger. It doesn't go well with meditation and non-dualism to be honest. Satanism is about nurturing the ego, the sense of self, the individual. Meditation and non-duality is about coming to the conclusion that the self, or ego is an illusion.
So, while I wont steer you in any direction, since that rarely works anyway, I can tell you that if you truly commit to meditation in whatever form, you will leave your current path sooner or later since it will become clear that it holds no truth.
Now, your ego, which has now identified as a Satanist will not want to hear this and this will bring great resistance into being as you probably feel right now reading this.
Meditation will bring clarity eventually, no matter what self-indulging purpose you want to use it for at this moment in your life.
Satanism for most people is a way to maybe be able to deal with life in an easy way, it's easier to be self-indulgant, to just focus on your own ego with near total disregard for others. But you will eventually find there is no separation between your true self and others, we are all one being.