Also available, but not always on the menu, is caesar salad. One of our friends had it every. single. night (for 12 days). We don't have kids so I never knew that chicken soup is always available off that menu until our last cruise. The AP show night has a set appetizer plate which has seafood so I can't have it in case any of the other items have contacted it. My server suggested the chicken soup (with Mickey head noodles!) so I now know it's an option if I ever don't like the appetizers or I'm not that hungry.
Also, as others have said - try something and see if you like it since it doesn't cost anything extra if you don't. Or ask for sauces or dressings to be removed, go for something simple like grilled steak, chicken breast or fish which are usually always on the menu (I found that they're not always listed on the app but they're always on the menu and/or you can ask for them). One of our friends on a different cruise had steak and steamed veggies 4 nights out of 7. Ask for different veggies, more potatoes, etc. They'll do their best to find something you like. There's also usually a simple pasta or rice dish. Or order multiple items off the children's menus or see if they'll make you a larger plate of items off that. There should be lots of combinations that you can try to satisfy you. Or come to dinner not very hungry after eating pizza, burgers, tacos/shwarma/paninis (depending on ship and offerings), hot dogs, fries, sandwiches or salads from on deck. Or do that after dinner if you're still hungry.
My tip for OP is that you are not boxed in to ordering one item each from the appetizers, soup/salad, and entrees. You can skip an entrée and order two or three appetizers instead.
I usually ordered two of appetizer, soup or salad depending on what was on offer that night, and entree and no dessert. Sometimes I didn't like the appetizers and had soup and salad, sometimes two appetizers and no soup or salad, very occasionally 1-2 appetizers, soup and/or salad and no entree. I just had them bring the salad during the entree course since it didn't need to be kept hot so could be time-shifted a bit without slowing them down. So many different combos. We had tablemates once who ordered 3-4 entrees between the two of them (no appetizers or soup/salad) and then shared between them so that they could try lots of different things.
Don't stress over it. You'll probably find enough to eat and they'll do their best to find what you like.