After graduating from mechanical engineering, you should either teach, take an examination of civil servants or enter an enterprise.
The first two have nothing to say. There are three development directions about entering the enterprise: technical talents, management talents and sales talents. Graduated from mechanical engineering, no matter engaged in technology or sales, it is good. There is no difference between the two, just whether it suits you. Therefore, after entering the company, it is a feasible development direction to either do technology or sales, and then develop into management or specialize in professional skills.
The most important thing is that you know what you want.
In fact, design experience is more important. It is also possible to find a good tutor to take you to do the project after graduate school. If no project is assigned to you and you are not allowed to work outside, you will be abandoned after three years. In fact, work is better than anything.