You could add nuts like shelled pistachios or walnuts as snacks. Even mix things together to make your own granola/snack mixes with dried fruits, nuts, oats. And you can make different varieties so it doesn’t get old. Example: Almonds, dried cherries, oats. Or pistachios, dried cranberries, pretzels

Or you can buy them, there’s a huge variety of sweet or savory and even spicy in stores.