Reflective practice is essential to teacher development. Every teacher takes their own development path based on their experiences and feedback received from others. Brookfield's Four Lenses: Becoming a Critically Reflective Teacher explains why.
Creating a Digital Portfolio is one of the most insightful and powerful things you can do to improve your teaching.
Having a Mentor is another. "In the literature of faculty development, mentoring is usually mentioned as a vital contribution to a successful academic career..." The 2007 paper, From Mentor to Mentoring Networks: Mentoring in the New Academy, maintains its relevancy today, as evidenced by University of Windsor's Peer Collaboration Network, which is run by faculty members.