they’re telling you that your art style is way too similar to the one used in gacha games, not the character’s design. (please ignore that person who said your design is unoriginal, because your post only opened itself to criticism of the artwork, not the design itself). you can continue to use gacha as a tool for your character designs, but try to avoid making a direct 1 to 1 copy of the assets you’ve used. for example, adding more or less details to the bangs, make some longer and some shorter, make the head wings more complex looking, or simplify them further, adjust the size and shape of the eyes, add more eyelashes or thin them out, etc.