If you only seek validation from others then you're going to make yourself miserable.
Ego can also be a good thing. Just look out for pride. It largely depends on wherever one "gets results" or not. If you got results to fall back on then you can work with that. When people don't though that's where things get tricky.
People tend to assume and expect things to be a certain way. The most effective way to teach people to be humble is to strip away their delusions to the point they are nothing. Legit. It's the best starting point.
I was humble once. Now I'm not stopping. I can take pride in what I do, that so many fail to do. I have results to fall back on now though. It's when people have yet to understand they can get results that they'll doubt themselves more.
Some people will understand that it can all be a lie. When one reaches a point where there's only observation without judgement then that may be what people call humble.
It might take great pain and loss to understand that. To not fear death. Seems to be the case. People that have nothing to lose seem to have a better understanding.