Just having an engineering degree is only the start. You need a lot more than this before you can consider yourself to be a "well skilled mechanical design engineer".
Also, it is very important to know that there are many people who can take themselves as such without a degree of any kind.
Develop CAD and engineering layout skills for that you can refer
https://www.clariwell.in/best-mechanical-design-courses-in-pune
https://www.clariwell.in
https://www.clariwell.in/blog/Technical-Highlights-and-Roles-of-Mechanical-Design-Engineers