In a small bowl, mix together the chili powder, cumin, garlic powder, salt, pepper, oregano, onion powder, smoked paprika, and ground cinnamon.
Rub the steak with avocado oil and sprinkle the spice mixture evenly over both sides of the steak, pressing it into the meat.
Preheat the Blackstone griddle to high heat. Place the steak on the hot griddle and cook for 3-4 minutes per side for medium-rare, or longer if desired.
Remove the steak from the griddle and let it rest on a cutting board for 5 minutes.
While the steak is resting, warm the corn tortillas on the griddle for about 30 seconds per side.
Slice the steak against the grain into thin strips.
To assemble the tacos, place some sliced steak on each warm tortilla. Top with diced tomatoes, red onion, and chopped cilantro.
Serve the tacos with lime wedges on the side for squeezing over the top.