try the reverse, which is a lot more interesting

The male protagonist had a reputation, as one of the strongest, the best in his <insert> school, but in actually he is the weakest and can use any kind of <insert> abilities, and his reputation came to be because misunderstanding. And he had to keep up of his reputation, because of reason(being expelled etc), solely by using his brain and brawn

and the only one that did this

Mx0
I guess it normal that people like first one more because it's easier to self insert, <I was just pretending to be weak lol>