I don’t know if something like this is available where you are, but in the US there is a brand of milk owned by Coca-Cola where they filter out the sugars (lactose is a sugar), it is called Fairlife and is marketed as high protein milk. It still retains the fats and proteins and flavor of ordinary milk. It comes in a variety of fat percentages like ordinary milk for people with different dietary preferences.

My favorite plant milk is soy milk, but that isn’t as readily available out here as it used to be since conservatives decided drinking it would turn men into girls. I find oat and almond milks too watery and unsatisfying in drinks.