To spice up your potato soup, start by adding more herbs and spices. Garlic, onion powder, paprika, thyme, oregano, and parsley are all great options to add flavor to the soup. You could also try adding some diced jalapeño or red pepper flakes for a little heat. Another way to add flavor is to top the soup with something crunchy. Try adding crumbled bacon or cooked sausage, shredded cheese, or even crushed tortilla chips for an extra layer of texture and flavor. For a vegetarian option, you could add roasted chickpeas or pumpkin seeds for a nice crunchy contrast. Finally, don't forget about the garnishes! A dollop of sour cream or Greek yogurt can bring some tanginess to the soup while fresh herbs like chives or cilantro will give it an herbal kick.