The hardest thing is cutting out dairy for me. Gluten, no prob. Sugar, fine. Dairy? Ugh. That requires lots of substitutes and none are good.
For coffee, I assume you’ve tried all the oat milk creamers?
I haven’t tried oat milk yet so will try this week. The best so far have been nutpods (plain I hate flavored creamers).
I like coconut milk, but you can usually taste it. Almondmilk in coffee is vile, something about the heat of the coffee. I like the flavor of it over cereal.