Combine the ingredients for the Blackening Seasoning in a small bowl and stir to combine. Set aside
To prepare the coleslaw, add the sliced cabbage and shredded carrot to a large, non-reactive bowl.
Whisk the Greek yogurt, apple cider vinegar, ground cumin, Dijon mustard, and lime juice together in a smaller bowl.
Pour the dressing on top of the cabbage and carrot. Season with salt and black pepper, to taste, and toss to combine. Set aside.
Generously season both sides of the fish with the blackening seasoning and rub to cover the entire fish and to make sure it adheres well. Carefully slice the fish into bite-sized pieces and set them aside.
Add the olive oil to a large skillet and heat over medium heat.
Once the oil is heated, add the seasoned fish and cook until opaque and flakey, approximately 3-4 minutes per side. Remove from heat and set aside.
To serve, evenly divide the creamy coleslaw and blackened fish between the 8 tortillas.
Top with the sliced radishes and fresh cilantro leaves.
If desired, drizzle some Creamy Avocado Sauce on top.