Oh god, it's clear that the author is just trying to hide their atrocious writing using tits.
Am I seriously expected to believe that this absolute fucking cretin never even tried to use his buffs on himself? And that no one has even suggested it to him? This is an unbelievably bad setting.
yeah.. it did confuse me "Of course you get stronger if you cast buff on yourself. it" it is a Duh moment. plus he did level up if that exists in this world.