Cassie emphasizes the importance of proactive self-care to maintain mental health and balance in life, especially during stressful periods. She advises against succumbing to inactivity when overwhelmed by stress. Instead, she recommends engaging in activities that shift your mood and clear your mind, such as taking a walk, spending time on a treadmill, or indulging in small joys like buying flowers, chatting with a friend, or reading a magazine. These actions, which may seem trivial, can significantly uplift your spirit and help maintain your mental well-being.