Also have a look at managed futures. It takes a bit to understand what is going on (as one should), but the basic strategy (trend-following) has existed and paid for a long time. They tend to have low correlation with stocks, but higher returns than bonds. Fees where high in the past, but so where returns. The fees have come down significantly, and (or as) solid index replicators have entered the market. Returns where low in the 2010s, but have taken up again, so make of that what you will.
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