RazackCh
you should use future knowledge of the series to become rich and famous, or either also using knowledge of the famous songs of the protagonist's original world, or famous mangas and books.That way you could create things that don't exist in that world like dragon ball, Naruto, one piece, Harry Potter, etc etc, as well as famous songs from the original world, that way, although considered cheating, you could grow quickly and earn a lot of money, You could even create famous games with the help of programmers, things like Minecraft or games that are more or less easy to design and become very famous. that way you would be not only a millionaire, maybe even a billionaire
also MC should make some manga or novels that are esay to remember, for example, the Dragon ball manga or naruto manga, if i remember corrctly mc started painting since he was a baby, he should be good at it right now, or maybe in afew years be good enough to became a mangaka and release one of those mangas, the amount of fame and recognition he will get with this will be far better than he has right now, since its diferent be a genius kid that is a great actor and be a mangaka of a innovation manga like those.