How to Become the Strongest Without Cheating

I'm ordinary, I'm not like the main character, both of my parents died. I am not bullied by the villain like the male protagonist. I'm not like the male protagonist. I'm obviously weak, but in fact I have the best background in the world. I'm just a little transparent in the world How can I become the strongest without cheating? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.