Find out where high-status or wealthy people congregate for recreation. Pay close attention to their culture, mannerisms, language, and dress. Practice emulating them until sufficiently skilled. Frequent the same places as them until some begin to recognize you and believe you are one of them. Then, make them actually enjoy your company.
In modern times, this would probably be called “networking” or “sales”.
And, then there is marriage. Another ages-old strategy. But, pretty much the same strategy as above.
The rest of the wealthy people whom I personally know worked hard at software companies before the 90s and reinvested in equities, and later, real estate. (These cases could be considered luck, though. They had to be in the right place at the right time. And, that same strategy didn’t work only a decade or so later.)