Add olive oil to a Dutch oven and place over MEDIUM heat. Add ground beef, onions, and garlic and cook, stirring to break up the beef until beef is crumbled and no longer pink. Drain well. Season with salt, pepper, Italian seasoning, and cayenne. Add the tomato paste and stir well to combine. Add the tomatoes, 4 cups of the broth (reserve remaining amount for later), carrots, celery, potatoes, bell pepper, and rice.