First of all, before the age of 30, you must master the special skills in your industry, which is the most basic professional skills.
Secondly, the social resources of my work in recent years have also played a vital role in my own development. Many people quit their jobs or start their own businesses by relying on their accumulated personal resources. With contacts and professional resources, they will get twice the result with half the effort.
Therefore, after the age of 30, it depends on whether personal expertise and resources are extensive.