One of the more realistic answers that isn't a get-rich-quick-scheme is to invest your capital and retire early, aka "financial independence". If you're young and don't have a super low salary, you can invest as much as you're able into index funds every year and still retire way before 65 (even with a salary of e.g. 50k). It takes commitment and a little bit of frugality though. On a semi-related note, "LeanFIRE" describes an even earlier retirement where you retire with just enough to live off of, and probably make some concessions in return for retiring sooner.

Not a very "immediate" answer, but if the thought of working yourself to death your entire life is the primary concern, then this is an early way out.