In a small bowl, add the soy sauce, gochujang, cornstarch, honey, sesame oil, rice vinegar, garlic, ginger and ½ cup water. Set aside.
Heat a large, nonstick skillet over medium-high heat until hot. Add the avocado oil and when shimmering, add the seasoned ground chicken and cook, breaking up the chicken with a spatula, until browned and cooked through, about 4 to 5 minutes.
Add the red bell pepper and celery, cooking until just softened, but still has a bit of crunch. Add in the sliced scallions and soy sauce mixture, stirring frequently until slightly thickened, about 2 minutes. Taste for seasoning, adding salt and pepper if needed.
Serve chicken and vegetable mixture in warm tortillas and garnish with desired toppings.