Combine the lime juice, cumin, paprika, garlic, salt, and pepper in a large bowl. Add in the tilapia and mix until coated. Cover and place in the refrigerator to marinate for 20 minutes or longer. (You can do this step the night before to save time the next day!)Heat the olive oil in a large skillet or casserole over medium-high heat. Add the onions and cook until they begin to soften, about 3 minutes.Add the pepper strips, tomatoes, and marinated tilapia.Pour the coconut milk over everything, cover, and simmer about 20 minutes, stirring occasionally.In the last few minutes, stir in the cilantro.When the tilapia is cooked through, garnish with additional cilantro (if desired) and serve.