Your hero will encounter a major systemic barrier in their search for more-efficient earning: modern economies generally only pay for a person's time, without regard for their productivity. That's how this chart is possible:
This works to the advantage of wealthy capitalists and creditors, and to the disadvantage of all other people. It is not an accident. I mention this because this means your hero must very deliberately choose something that exists in one of the increasingly rare pockets of the economy that has not been permanently captured by profiteers.
Unfortunately for your hero, most of those pockets are centered on either personal celebrity (which often boils down to sexual appeal), or some form of artistic creation. You don't mention your hero being an unusually creative artist, so that leaves sexual appeal. Unfortunately, there are millions of people standing in line to get "found" in this way, and it's not something your hero can force by their own effort.
But here's one exception:
Fitness guru
Fitness gurus get paid by the unit sold, not by the hour. Perhaps it takes five sixteen-hour days of shooting to produce a one-hour workout special, but your hero gets the lion's share of every sale for as long as the thing is on the market, which could be a decade. Also, the economic gatekeeping in the fitness market cannot possibly be as thorough as the gatekeeping in the regular media, and raw performance can probably break through that ceiling even if the industry leaders are hostile because they aren't getting their beaks wet.
Your hero, being supernaturally strong and tough, essentially has an unlimited supply of counterfeit goods to sell. They presumably has an enviable physique that requires zero effort to maintain, and can perform feats of strength that no competitor can better.
A standard disclaimer will allow them to imply that customers who stick to the program might someday be able to bend bars and lift (partial) I-beams.
Of course, this is sort of a con. Since your hero's physical fitness is not the product of dedicated effort, them will not have a good-faith reason to believe that the workout is excellent in any way. Some might not be comfortable perpetrating a massive swindle. And a determined opponent could attempt to prove that the workout could never achieve the suggested results. (That could be something a nemesis tries.)
