Refute your opinion: Why middle income stuck in middle income

Middle income people get stuck in middle income socia ladder because this so called "poor" mindset determined their action. It's perfectly normal to remain middle income. Middle income social ladder is not bad at all. Many middle income family can accumulate a lot of wealth from traditional means like 401K and their primary residence. I myself have lots of "poor" mindset. I am struggling with my "poor" mindset everyday. One good thing is that I can now more easily see through myself and identify what is my "poor" side psychology, and what is my "rich" side psychology. That's how I can improve myself.