1. Preheat the grill to medium-high heat. Season the fish fillets on both sides with salt and pepper.
2. In a small bowl, combine paprika, cayenne, garlic powder, and cumin. Sprinkle the spice mixture over the fish on both sides.
3. Brush the grill grates with oil to prevent sticking. Place the fish fillets on the preheated grill and cook for about 3 minutes per side, or until the edges are opaque and the fish flakes easily with a fork. Transfer the cooked fish to a plate and let it rest for a few minutes.
4. While the fish is resting, prepare the cabbage slaw. In a large bowl, toss together the shredded cabbage, chopped cilantro, minced green onions, minced garlic, distilled white vinegar, kosher salt, and white sugar. Mix well to combine.
5. In a separate bowl, make the lime crema by whisking together the sour cream, mayonnaise, lime juice, lime zest, and salt to taste.
6. To assemble the tacos, warm the tortillas on the grill or stovetop. Place a portion of the grilled fish on each tortilla, top with the cabbage slaw, and drizzle with the lime crema. Serve the grilled spicy fish tacos immediately and enjoy!

Note: Feel free to customize your tacos with additional toppings such as diced tomatoes, avocado slices, or hot sauce for extra flavor and heat.