Katy Y.
My first option would be to go for yoghurt, Greek is my go to. Alternatively try looking at other country cuisines for inspiration. Some other countries enjoy soups or broths or even what we might consider to be “lunch/evening meals” for their morning meal. It might seem strange if you are used to more “western style” breakfasts of cereal, toast, eggs, bacon. Hope you find something to tickle your taste buds.