I usually tell people to up their protein intake because protein is an important building block of bones, muscle, cartilage, skin and blood.
You need it to shape, strengthen your body. Can you do it without it (or with low intake)? Yes sure, but it would take you so much longer. Your muscles use it repair and grow, without it, your recovery and progress would slow down.
Another thing about protein, gets you feel full faster and keeps you full longer and that helps with portion control without even thinking (Speaking of portion control, you might want to check this article). Especially when it compares to carbs. You know there is almost no limit the amount of carbs you can eat in one sit.
When I say eat more protein to my clients, they tend to be more mindful, planned and more picky when it comes to their food choices. That brings good habits, less mindless eating.
I prepared this cheat sheet for macro nutrition (protein, carbs and fat). It simplifies the whole thing. Getting into habit of checking the nutritional facts helps a lot with improving diet habits. You can also use apps such as MyFitnessApp to keep a diet journal.