I am an A-class crew member and want to board a domestic ship. Will my certificate be downgraded?

I used to work in PCL, Singapore, and many of my brothers on board have now returned to work in China. If they are the crew on duty, please come back quickly. The salary is similar. My brothers surf the Internet every day, which is cool. After working for 3 or 4 months, they will go home to have a rest. The certificate is still your original certificate. No problem, no degradation, no bad use. Don't worry, brother. Good luck.