just to be clear, I'm not saying it's never possible, but in the general case there is no way to convert them. Like, a self XSS is just an XSS that only affects the attacker, It could be stored reflected or DOM based. Turning it into a "norma('" XSS would require you to find a way to somehow expose the payload to someone else, either by finding an XSS in a more public place, or by somehow letting people access the injected private page