It's very weird that there is no Adventure genre. I understand that Tapas wants to limit the genres, but there's also BL, GL and LGBTQ+ genres (making up 25% of the genre list), and Gaming as well (which is the first time I've ever heard of it being a story genre).
Maybe they're hoping Action and Slice of Life would fit all Adventure type stories, or that Adventure is too broad a genre, but you have Fantasy and Science Fiction which are huge, huge umbrella genres.
I think, until they actually add an Adventure genre, you're going to have to just stick to Fantasy and hope for the best.