Preheat grill to medium-high heat.
Toss shrimp with olive oil, chili powder, ground cumin, and garlic powder in a large bowl until evenly coated.
Thread the seasoned shrimp onto skewers to prevent them from falling through the grill grates.
Grill the shrimp for 2 to 3 minutes per side until pink and opaque. Remove from grill.
Whisk together the Mexican crema, lime juice, and half of the fresh cilantro in a small bowl.
Warm the flour tortillas on the grill for about 30 seconds per side.
Assemble tacos by adding a layer of shredded cabbage and shredded carrots to each tortilla.
Top the slaw with the grilled shrimp and drizzle generously with the cilantro lime crema.
Garnish with the remaining fresh cilantro and serve immediately.