Sanji is a good character already he’s got everything , family , heritage , power and reputation
I guess the only thing that would make him better is reaching the pinnacle of a world level power as the main fighter for the strawhats and achieving his dream
maybe a Sanji meets the girl of his dream arc and he’s force to stop lusting for other women.
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Another thing that Sanji can do is be a great pirate that brings light to those who starve, a great pirate chef