How do I stop judging by its cover? (Literally)

I've been wanting to read more, and I usually just read non-fiction or philosophy, whenever I do read once in a blue moon. But lately I've been wanting to read something fantasy, or sci-fi, or just anything different really. Problem is, half the time I look at a book cover and I am immediately disinterested in it. I know this is a dumb question but hey, worth a shot.