Avocado and Tilapia Ceviche

Name: Avocado and Tilapia Ceviche
Ingredients: 2 pounds tilapia fillets, cut into cubes, or more to taste; 2 small semi-firm avocados, cut into cubes, or more to taste; 8 cloves garlic, minced, or more to taste; 1 habanero pepper, minced; 2 teaspoons chopped fresh cilantro; 1 teaspoon salt; 1/2 teaspoon ground black pepper; 1/8 teaspoon ground ginger (optional); 30 fluid ounces lime juice, or as needed; 1/2 large red onion, finely chopped; 20 small flour tortillas, or as needed (optional)