It has nothing to do with Wonderwoman herself. She is a fairly iconic character. It has everything to do with the world around her and how DC sells her. WonderWoman's supporting cast is very ill-defined. Characters like Steve Trevor and Wondergirl often go for decades without appearing in the comics. Wonderwoman doesn't have a recognizable city to protect(which often comes with supporting characters in it). It also doesn't help that DC fails to sell WW in any way to a male demographic. That might sound sexist at first, but hear me out. Most people think Batman and Superman are aimed at a male demographic, but that's only partly right. Characters like Batgirl Batwoman, Supergirl, etc. exist primarily because the people running the Batman and Superman franchises decided to increase the character's popularity by reaching out to other demographics. So now you have a situation, where Batman is dominating his own primary demographic( young men), and chipping away at Wonderwoman's primary demographic ( women, and LGBTQ) via his spinoff characters. Wonderwoman really doesn't have an answer to that.