For those who go out to earn money to support their families, how can they be tired? If you like this profession and are passionate about it, you will never feel tired no matter how hard you work. If you don't like doing this thing, no matter how simple it is, you will feel tired and boring.
As a job, of course it will be quite hard. The competition is so fierce now, what can I do that is not tiring? The most important thing is your mentality. If you treat your work as a career, you will be passionate and won't feel tired.