May I suggest homemade yogurt or keifer. Even lactose sensitive folks can usually eat it since the milk sugars are eaten by the lacto bacteria. Just a thought.
I also make kimchi. Theres a zillion variations if you’re like me and hate kimchi. Basically just letting something ferment in a brine. You can put whatever you want for flavor. Kimchi is just traditionally a certain way.
-Add some prebiotics like querciten to your diet.