Being middle class has value, being upper class has value, being rich has value, having a degree has value, having provided a meaningful recognisable addition to human development has value. It's so easy to have such a number drop to 50% or to zero even, without changing anything about your value, your opportunities etc. For instance if Elon Musk lost all his money tomorrow you bet he would still be able to attempt another huge project next week. But if I give you one billion dollar, you might still not be able to start a project of the same size, because you miss the skill, connections, track record etc.
The most important thing to worry about is actually doing something valuable for the people around you. The more people you can influence positively the better your life will become as well.
Example: In my country there's a start-up that tries to revolutionize the train system. All they achieved was to repair one second-hand train, rent the railway slots to drive once up south to north and once down north to south, a few days a week. Then they ran out of money.
But! It really influenced a lot of people positively, made great press, showed strong customer engagement. So even after going broke they were able to continue after a short break, because someone bought them. No money, no profit, loads of way-too-hard-work nobody else wants to do. And still they are able to get this working, because they provide something provably valuable.