Growth mindset is hard to achieve. Humans tend to look for comfort and stick with it until something happens. No one really wants to get out of their comfort zones until they are forced by an event or a difficult situation. Rarely have I ever encountered a person who wants to change something and actually do something about it, though it is still possible with the right approach and the right support.
It's not hard at all, it's like learning to swim. Some people are too scared to swim and/or leave their comfortable life for adventure. But it's definitely not a thing of difficulty, as long as you have the determination to see it through.
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Can a person’s mindset change?
Just as someone can grow and develop their intellect, a person is also capable of changing brain functions and their thinking patterns. Therefore, one's mindset can be changed.
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I still remember a sentence from one of our church pastors, if you want your lifestyle and mindset to be better then improve your circle of friends. the circle of friends influences a person's thinking, so it is not surprising that those who like business will have a close friend who is a businessman while those in the working class will only be friends with workers. Changing your mindset is also not a bad thing, if someone doesn't want to order then don't expect their mindset to change, usually people who are successful in changing their mindset are like being reborn.
You are the average of your 5 closest friends you hang around with, so yeah they're right.