a little more fat. soy milk makes really great sauces (and cakes…). i don’t like the taste of soy milk by itself, but other people do like it. in that case, soy milk would work on oatmeal also.
i have some friends who discovered that they love putting oat milk in their coffee. it seems to work really well in terms of consistency and texture. you might even try making your own oat milk, though i have no idea how well that would work as that’s one i haven’t tried making myself before.
coconut milk and coconut cream (whether store-bought or one you make yourself) can be a great addition to many 