The Discovery Survey, the results of which feed into the Talent Guide, is designed to capture your natural, ingrained tendencies. Those tendencies tend to be stable over time. Even if you try to develop in a particular Talent, that Talent may still be difficult for you on days when you are stressed or tired (i.e., when you revert to your natural tendencies). That said, deliberate, consistent work on a Talent may ingrain a change such that it becomes natural for you to act in that way.
Read this article for more information about retaking the Plum Discovery Survey.
Find more information in the following articles:
What is the Plum Talent Guide?
How can I view, print or share my Talent Guide?
How should I interpret my Talent Guide?