Colleagues always take your job. What should I do?

I think work is a place to cultivate one's ability and keep learning. There are such people everywhere, and I met them when I was in college. But I think you can use this as a kind of motivation. If you do more things, your ability will naturally improve. When there is nothing to learn, it is time for you to find another job, because talents are everywhere, and working in a place that doesn't cherish talents for a lifetime is not your destination.