I have to make sure I don't quit working here too soon!
I don't want to quit this job without giving it a good try first!
ーI have to make sure I don't quit working here too soon!
「ここでの仕事をすぐに辞めないようにしなきゃ！」
to make sure で「必ず〜するようにする」
to quit working で「仕事を辞める」
ーI don't want to quit this job without giving it a good try first!
「まずやるだけやってみることなく、この仕事を辞めたくない」
to quit the job で「仕事を辞める」
to give it a good try で「試しにやってみる」
ご参考まで！
カナダ 
