In a mixing bowl, combine the shrimp with olive oil, chili powder, garlic powder, ground cumin, paprika, salt, and pepper. Toss until the shrimp are evenly coated with the seasoning.
Heat a skillet over medium-high heat. Once hot, add the seasoned shrimp to the skillet in a single layer. Cook for 2 minutes on one side, then flip and cook for another 1-2 minutes until the shrimp are pink and opaque. Remove from heat and set aside.
In a small bowl, prepare the spicy lime crema by whisking together sour cream, lime juice, lime zest, cayenne pepper, and salt until well combined.
Warm the low-carb tortillas according to package instructions or over a skillet for a few seconds on each side.
Assemble the tacos by placing an equal amount of cooked shrimp into each tortilla.
Drizzle the spicy lime crema over the shrimp in each taco.
Garnish the tacos with sliced avocado, shredded red cabbage, and chopped cilantro.
Serve immediately and enjoy your Keto Shrimp Tacos with Spicy Lime Crema!