Taste is the most important factor in nutrition.
Because you get the most nutrients from the foods you'll actually eat.
So add cheese, oil, spices, vinegar, sauces, etc. Try them roasted or sauteed or pureed, etc.
The actual secret to eating lots of fruits and veggies and other nutrient dense foods is:
Make them taste good. That's literally it.
Fun Fact about me: I eat like a toddler. Despite the fact that I know A Lot about nutrition, and I recognize that I literally feel significantly better when there's lots of fruits and veggies in my diet, I will not actually eat these things Just Because They're Good™ For Me.
It literally has to taste good or I will mush it around with my fork and reject it. So I add cheese and roasted nuts and balsamic glaze and oil (and spices of course, but those are insufficient by themselves) to my veggies almost every time. It's the only way I'll actually eat them.
Prioritize taste. Nutrients are so important, but force feeding yourself gruel is miserable and not a long term solution. Make the nutrients Tasty.
Enjoying your food is not a vice. Refusing to eat foods you don't enjoy is actually extremely normal and rational behavior.
If your body thinks it tastes like poison your body won't want it.
