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One important factor is that they should be baked in a single layer that is not overcrowded. Crowding prevents the heat from getting to the entire surface of the sweet potato fries. Otherwise, I would just try increasing the cooking time. Bake them for 15 minutes instead of just 10 before turning them and then bake them for 25 more minutes. Check for crispiness and if they are still not crisp enough, continue to bake at 5 minute intervals until they are to the desired crispiness. To get nice crispy potatoes with any recipe it seems like it takes additional time, even with the frozen fries you buy in the store. But it is well worth the extra time!