The gender spectrum should be a circle rather than a line.
The gender spectrum circle: infinite amount of points revolving around the ideas of identity and expression. A spectrum in which male and female aren’t halves of a whole population; a spectrum in which someone can be outside of the two genders without being out of the spectrum, or someone can be an entirely third gender without concerning themselves where they belong because they know their place isn’t on a flat line.
Every infinite point doesn’t need to have a name or a label, it just has to be known that there are people who can be any variation of male and female or outside of both to an infinite degree: something the line drawing doesn’t convey.