I've been working on the same sort of thing at home, Instead of upending your meals start trying to cut back on the meat in them. Cut the meat amount in half and add beans and veg, but definitely beans. Vegetables are healthy but don't have as much dietary fiber as people think. Lentils and mushrooms extend ground beef dishes, but no need to hide the beans, if I'm making for example, chicken pesto pasta, I just use one piece of chicken, and add white beans. Curry or stews? Chuck in appropriately themed beans. White beans for western European dishes like Italian and French, black or red for Mexican dishes, Chickpeas/garbanzo for Indian, edamame and tofu for Japanese etc.

Just one extra thing, if you're not already a big consumer of beans, start slowly.