This piece from Morgan Housel sums it up. I'll end it with one of my favourite quotes:
"Getting rich can be the biggest impediment to staying rich.
It goes like this. The more successful you are at something, the more convinced you become that you’re doing it right. The more convinced you are that you’re doing it right, the less open you are to change. The less open you are to change, the more likely you are to tripping in a world that changes all the time.
There are a million ways to get rich. But there’s only one way to stay rich: Humility, often to the point of paranoia. The irony is that few things squash humility like getting rich in the first place.”