The context is at least explained why he thinks he isnt that strong. He got as strong as he is now fighting people who were vastly stronger in his imagination so to him hes still weak. Its not great writing but it at least tries to explain it vs other works that just blatantly ignore it.Another dumb plot of the protagonist being stupidly over powered, but doesn't realise how strong he is. It's very annoying at this point, she literally explained to him that he is freakishly Overpowered and his immediate response was to train because he thought his strength is at the very bottom. Atp logic just flies out the window