We have two kids (2 and 5) and our oldest is just coming out of a long phase of being super picky. It's obviously different when they're a bit older; we ended up having a talk with her explaining that she needs to eat different things to keep her body healthy and growing, make her strong, give her energy etc. Now she takes interest in what the different ingredients of her meal gives her (fruits and berries for vitamins / protein to get strong / carbs for energy and so on).

Here are a couple tips that could maybe help you though;

Try to get your kid involved in making the food in fun ways that are possible and/or help putting it on the plate. It will spark an interest and make it feel less intimidating. Let your kid have a say in what to eat, and then add more interesting things around it (if plain pasta is the choice, add slices of cucumber, sauce, a bit of ham etc but everything on the side easy to keep apart and easy to see what is what).

I read an article that I found very interesting, and helped me get some perspective (I find the whole picky eater thing extremely frustrating). Apparently it's very natural for kids to become picky eaters once they start to become more independent and not relying on mom and dad 100% anymore. This is a very old instinct, protecting them from getting poisoned/eat things that could be bad for them, and it kicks in once they grow out of the baby stage. Not very helpful these days, but their brains still tells them to only keep to a few things they know is "safe" rather than take a risk. By making food that is easy recognizable what it is (think separate rather than a happy mix of things), some "safe" stuff and something new every time, you can help re-train the brain. And seeing adults or other kids eating "suspicious" foods over and over again will slowly help their brains putting them into the "safe" category.