The most sustainable path to compounding long-term capital is to hold a diversified portfolio of domestic stocks, international stocks, commodities, hedge funds, venture capital, private equity, and real assets. Can even throw in some Bitcoin and bonds for good measure. And at least 25% allocation to "market-insensitive" assets such as hedge funds, reinsurance, bonds, cash, etc.
It's unfortunate how few investment solutions exist that combine all these asset categories into one portfolio.