Whisk together taco seasoning, lime juice, garlic, and olive oil to make the marinade.
Place the ribeye in a resealable bag or shallow dish, pour the marinade over, and coat well.
Seal and refrigerate at least 30 minutes.
Preheat the air fryer to 400°F (200°C) for a few minutes.
Remove the steak from the marinade, pat dry, and let sit at room temperature briefly.
Place the steak in the basket in a single layer, without crowding; cook in batches if needed.
Air fry 8 to 12 minutes, flipping halfway, until it reaches your preferred doneness.
Rest the steak a few minutes, then slice thin against the grain.
Warm the tortillas in the air fryer 1 to 2 minutes.
Fill the tortillas with steak, add toppings, and serve immediately.