The question of what God was doing before the Big Bang is a philosophical and theological inquiry that has been debated by various religious and philosophical traditions. Different belief systems provide different explanations or perspectives on the concept of God and the nature of existence.
In the context of Abrahamic religions such as Christianity, Judaism, and Islam, God is often considered timeless and outside the constraints of time and space. This perspective suggests that God exists beyond our understanding of time and is not bound by it. Therefore, the question of what God was doing "before" the Big Bang, which marks the beginning of our current universe, may not be applicable from that viewpoint.
In other philosophical or religious frameworks, there may be different interpretations and beliefs regarding the concept of God and the nature of existence. Some may posit that God exists within a cyclical or eternal framework, while others may have alternative explanations or theories.
Ultimately, the question you ask delves into matters of faith, metaphysics, and cosmology, and different individuals and belief systems may provide diverse interpretations and answers based on their particular worldview or religious teachings.