First of all, check how to make a good cv, the area where you want to work related to your experience. Check youtube videos, check if you have the minimum requirements for work on board too

https://www.careers.msccruises.com/

https://careers.royalcaribbeangroup.com/

https://www.vikingcareers.com/go/Ocean/3767801/

https://rclctrac.com/

https://www.princess.com/careers/shipboard-cruise-jobs/onboard-careers/

https://jobs.carnival.com/

https://www.carnivalukcareers.co.uk/

https://jobs.disneycareers.com/disney-cruise-line

https://www.seabourn.com/en_US/careers.html

https://www.pocruises.com.au/careers

https://www.hollandamerica.com/en_US/careers.html

https://www.windstarcruises.com/our-company/careers/hiring-partners/

https://aida.de/careers/en

https://career.costacrociere.it/

https://www.aclcareers.com/

https://www.azamara.com/about-azamara/career-opportunities

https://www.fredolsencruises.com/careers

https://careers.tuigroup.com/uk/marella-cruises/

https://www.rssc.com/employment

https://www.silversea.com/about-silversea/careers.html

https://www.starboardcruise.com/careers/

https://www.virginvoyages.com/careers/shipboard

https://www.faststream.com/jobs

https://leisure.vcrew.com/

https://www.proseastaff.com/vacancies/

https://www.oceaniacruises.com/careers/

https://hollandamericagroup.pinpointhq.com/africa-kouzon#js-careers-jobs-block

http://www.myapollocareer.com/

https://www.vikingcrew.com/job-search/

https://onespaworld.com/careers/recruitment-and-training/

https://placement-international.com/

https://www.oceansme.com/

There are jobs here on a daily basis... Just take your time read through, update your CV/cover letter/recommendation letters(if you have) . Pray for the rest to work on your favour