If your potato soup is still crunchy after cooking for 6 to 7 hours on high in the crockpot, it's likely that the potatoes were not cooked long enough or the crockpot may not have reached a high enough temperature. However, there may still be hope to salvage your soup without having to throw it away. Here are a few steps you can try:

1. Transfer to Stove: Pour the soup into a large pot and transfer it to the stove.
2. Add Liquid: Add some additional liquid to the soup. This could be water, broth, or milk depending on your preference and the flavor profile of the soup.
3. Simmer: Bring the soup to a simmer on the stove over medium heat. Allow it to cook for an additional 30 minutes to an hour, stirring occasionally.
4. Test Potatoes: Check the potatoes periodically to see if they have softened. You can use a fork to pierce them and see if they are tender.
5. Adjust Seasoning: Taste the soup and adjust the seasoning as needed. You may need to add more salt, pepper, or other seasonings to balance the flavors.
6. Continue Cooking: If the potatoes are still not soft after simmering for an additional hour, continue cooking until they reach the desired consistency. Keep in mind that the cooking time may vary depending on the size and type of potatoes used.

By following these steps, you should be able to salvage your potato soup without having to throw it away. Just be patient and keep an eye on the soup as it cooks to ensure it doesn't stick to the bottom of the pot or boil over.