Learning a new skill and changing jobs/getting promoted and (this is the tricky part) not getting on the hedonic treadmill but rather putting the surplus cash in low cost index funds will net you a far greater ROI.
Google "problem of induction"
Some people (Munger? Buffet?) believe The Coca-Cola Company will continue to exist, because it existed for that long (Lindy effect), so it must continue to exist. Why “must”? The problem is right here, you cannot reliably predict the future. Who knows what will happen by 2060?
Therefore, things like Kondratiev waves might be a new form of modern coffee cup reading.