I feel like for me there's a few different avenues; the obvious and most organic is ones that just stem from other kinks, and really might not be considered separate kinks at all, ie being into big muscular women but then later developing weird fascinations with specifically pumped up muscle groups like calves, necks, etc. Or sometimes they might just stem from taking a mild element I like and then pushing it to an extreme—there wasn't exactly any one moment where I went "oh shit that's hot" regarding like, weird saturated skin colors or extreme amounts of sweat, that just kind of happened out of nowhere lmao.

One of the other things is just like, the most common, widespread way a kink is depicted might not be to my taste and actively put me off of it, but then someone who draws it in a more palatable way might pop up and I go "hmmmm." Alternatively, I might just draw it myself and find that I can avoid the common aspects I dislike while focusing on the parts I do, which is kind of what happened with dicks and vore and whatnot. In doing so it also becomes easier to tolerate the previous depictions that put me off, even if I'm still not 100% on board. (and there might not be anything wrong with those depictions, per say, they're just not for me!)

and then sometimes it'll just come from somewhere completely unrelated to kink at all. A not insignificant amount of my "hmmm??" moments can be attributed to me reading a book or playing a game and going "okay but what if this was horny, that might be something"

as for the a kink I think I'd like but I don't, that's... I can't say there particularly is one that fits the bill, because if I THINK I'd like it I probably already would. I guess there's some some like, adjacent kinks that others might think I'd be into, like inflation or pregnancy, but I just can't really think of them as anything but being kind of like the stuff I like but with less appeal.