I don't have to work much overtime at my current job which gives me more peace of mind.
ーI don't have to work much overtime at my current job which gives me more peace of mind.
「今の仕事はあまり残業をしなくていいので、心にゆとりが持てる」
to work overtime で「残業する」
peace of mind で「心のゆとり」
例：
It was horrible how much overtime I had to work at my old job. I got really run down mentally. I changed jobs and I don't have to work much overtime at my current job which gives me more peace of mind.
「前の仕事では残業の量がひどかった。精神的にとても追い詰められた。転職をして今の仕事はあまり残業をしなくていいので、心にゆとりが持てる」
horrible で「ものすごい・実にひどい」
to get run down mentally で「精神的に追い詰められる・疲れ切る」
to change jobs で「転職する」
ご参考まで！
カナダ 
