Pat the shrimp dry with paper towels to ensure a perfect sear in the skillet.
In a small bowl, whisk together the chili powder, smoked paprika, ground cumin, sea salt, black pepper, and garlic powder.
Toss the shrimp in a medium bowl with the spice blend and lime juice until every piece is evenly coated.
Heat the avocado oil in a large non-stick skillet over medium-high heat until shimmering.
Add the shrimp to the skillet in a single layer and cook for 2-3 minutes per side until pink, opaque, and slightly charred.
While the shrimp cooks, warm the corn tortillas in a dry pan or over an open flame for 30 seconds per side until pliable.
Assemble the tacos by layering the shredded cabbage and sautéed shrimp onto the warm tortillas.
Garnish with fresh avocado slices and cilantro before serving immediately.