Regardless of which strategy you use, you must be prepared to accept losses. That is the most important. After all, there will also be days when you go into the minus, but everyone has that. Even professional poker players know that they can't always win. There used to be ways to make money in a casino, as you could count cards, for example. Security has been tightened up quite a bit in the meantime, so you can't do those kinds of tricks anymore, of course. Most gamblers in the casino are there for fun or addicted. There will be few who see gambling as work.
He only wants to make a profit of 100$, in that respect you could say yes you can do that. But there is an end to it, I don't think you can keep something like that for 1 year (365 days) in a row, regardless of the limit. You could use a strategy that will work for 99%, but such strategies often come with great risks, meaning you have to be prepared to bet your entire bankroll. Something like that has been discussed a lot with the martingale system, those things are doomed to fail. whether you should play poker for example.
But I get what you're trying to say. All in all, it's not possible to have a winning formula especially in luck-based games where you can earn as much as 100 bucks. That's just ridiculous and you'd have to have to god-tier luck if you're even looking to earn that big in gambling. 