Whatever your level of tai chi training, turn to the essential principles of tai chi to find new depth in your practice.
While there are many styles of tai chi, the principles describe tai chi posture, movement, and state of mind common to all types. Try to focus on just one principle at a time, incorporating it into your daily practice for a week or even a month.
Begin with Dr. Lam's clear introduction to the tai chi principles and then look at Yang Chen Fu's original ten principles translated by Mark Parzynski.