One of the reasons why it is so hard to stick to our diet is that we feel so deprived. Like we have a looong list of things we can’t eat, and a short and shorter one of things that we can.
So instead of deprivation, why not cultivation? Add a new food every day that you might not otherwise try, like a star fruit or a parsnip or a cloudberry. They are yummy, sweet, and healthy for you, and you will feel like you are having a real treat even though all fruits and veg are light in calories if eaten in moderation, and have lots of healthful fiber.