what makes it possible for well established traditions to change over time and how are new traditions created

The correct answer to this open question is the following.

What makes it possible for well-established traditions to change over time is the generational changes that appear when the younger generation brings their own set of belief systems and establish them as part of the new customs in society.

That is how new traditions created, by younger generations that develop a new set of belief systems that follow through until these became traditions instilled in different aspects of society, family, education, and business.

Of course, a change like this is always influenced by mass media and marketing that fosters consumerism, creates new necessities, and changes old ones.