Season the chicken breast with half of the sea salt and black pepper.
Heat avocado oil in a skillet over medium-high heat and sear the chicken until golden brown and cooked through, about 6 minutes per side.
Remove chicken from the pan, let it rest for a few minutes, then dice it into bite-sized pieces.
In a small bowl, toss the diced chicken with the buffalo sauce until evenly coated.
Prepare the high-protein ranch by whisking together the Greek yogurt, garlic powder, onion powder, dried dill, and the remaining salt and pepper.
Warm the whole wheat tortilla in a dry skillet for 30 seconds until soft and pliable.
Layer the shredded romaine, carrots, celery, and sliced avocado in the center of the tortilla.
Top with the buffalo chicken and a generous drizzle of the Greek yogurt ranch.
Fold in the sides of the tortilla and roll tightly to secure the filling before serving.