Video games: depending on the game, you can easily find a lot of women. MMOs tend to have a lot on my experience, although they tend to guild up together due to either gamer stereotypes and/or bad
experiences, so finding the guilds may by tricky. Just be nice, honest and honestly friendly, they'll find you.

Maybe try to 3d Print some anime models, paint them, put up on social media, you might even start getting requests if you finish them well enough. My GF and her friends hoard anime stickers like I used to do with magic cards as a kid.

Weeb shit: biggest Manga consumer I know is a late 20s woman with several thousand books in her personal collection. They're out there.

Hell, even just getting out into your local pokemon go group will get you out of the house, and frankly I know more women who (still) play that than men.

You could try Bouldering, there's usually a lot of women and getting starting a social interaction isn't too hard when working on a problem together