I'd like to work in a job related to passenger ships.
In the future, I'd either like to be a shipmate on a passenger ship or be employed in a job related to passenger ships.
「客船に携わる仕事をしたい」= I'd like to work on a passenger ship. / I'd like to work in a job related to passenger ships.
「将来、客船の航海士もしくは、客船に携わる仕事に就きたいです。」= In the future, I'd either like to be a shipmate on a passenger ship or be employed in a job related to passenger ships.
ボキャブラリー
客船 = passenger ship, passenger boat (船の種類によってcruise ship やferryという言い方も使えます)
I'd like to = ~がしたい、~がしたいと思います
work = 働く、~の仕事をする
job = 仕事
related = に携わる
future = 将来
shipmate, crew member = 航海士