Pema Chodron’s teaching has a strong focus on the uncertainty and the loss of control that we often experience in life, and how that can lead to the feeling of groundlessness. The following article provides a good summary of her approach to those topics: The Fundamental Ambiguity of Being Human
An article by Blanche Hartman discusses an approach to the impermanence and uncertainty of life known as Beginner’s Mind, or “don’t know mind”. You can find her article here: The Zen of Not Knowing
The practice of Insight Dialogue includes a guideline for opening to impermanence and the uncertainty of each moment, especially in conversations and relationship. The guideline for staying centered in the moment is to “attune to emergence”. You can find more information on that guideline here: Attune to Emergence