Honestly, I was born like this 😅 I just always loved to eat a lot. But maybe try to go after heavy calorie foods instead.

Try a triple peanut/almond butter sandwich with a smoothie of fruit, whey and if you like consistency, add oats to it, or greek yoghurt with peanut/almond butter, whey and crunched cookies.

If you really want to increase your appetite, what I've seen working with some of my slimmer friends, is starting to cycle, they say their appetite increases so much that they can eat more than they spent cycling.