On LinkedIn, follow an international agency called Silver swan recruitment. They post tons of international jobs on there. Seabourn cruises posts their own jobs on LinkedIn so go check it out. Also follow “The World” they are a mega yacht that posts their jobs also.
It’s called Gourmet recuitment international based in Cape Town. I have personally used her. She recruits for many many ships. Getting a job on the ship can take between 1-3 months because there’s interviews and trainings etc. They have a Facebook page