Here are the list of things that you can do after your graduation in Naval Architect
1. Go for higher studies if you have good grades and a budget.
2. There are ship maintenance companies who recruit naval architectures full time.
3. If you have good knowledge and friends with the mentality, a startup is a good option.
4. Go for MBA. Choose MBA only if you are not interested in Naval architecture since it can change your career path.
I hope it helps.